San Juan County, UT — Planting Guide
Top priorities for San Juan County, Utah gardeners in July
Your San Juan County, Utah garden is entering a new phase. Here's what's on the schedule for July and why each task matters now.
-
Get peppers, astilbe, and begonias seeds going inside
A seed-starting mix and a sunny window (or a grow light) are all you need. Keep soil warm — around 70°F — for fast germination.
-
Harvest basil, carrots, and cucumber as they ripen
The more you pick, the more the plant produces. Letting fruit overripen tells the plant it's time to stop.
Before August arrives, get these ready
- First harvests: basil, cucumber, and green beans
- Fall sowing: carrots, kale, and lettuce
San Juan County is in USDA Zone 7a. The average last spring frost is May 2 and the first fall frost is October 11, giving you a growing season of approximately 162 days.
At an elevation of 5,225 ft, San Juan County receives approximately 13.7 in of rainfall annually. Summer highs average 84°F with winter lows around 12°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 41 days year to year — ranging from April 15 in warm years to May 26 in cold years. San Juan County scores 46/100 (Moderate) on the Microclimate Index.
🌡️ Zone
7a (0°F to 5°F min)
❄️ Last Frost
May 2
🍂 First Frost
October 11
📅 Growing Season
162 days
⛰️ Elevation
5,225 ft
🌧️ Annual Rainfall
13.7 in
Monthly Watering Calendar for San Juan County
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
Why it matters: Mulch reduces watering needs 30-50% by cutting evaporation. San Juan County's 14" annual rainfall might be enough for vegetables in some months and not in others — a 2-3" mulch layer evens the swing.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1 in | 6 days | — | None |
| Feb | 0.9 in | 5 days | — | None |
| Mar | 1.1 in | 7 days | — | None |
| Apr | 1.3 in | 8 days | 3 in | High |
| May | 1.6 in | 8 days | 2.7 in | High |
| Jun | 1 in | 4 days | 3.3 in | Critical |
| Jul | 1 in | 6 days | 3.3 in | Critical |
| Aug | 1.6 in | 7 days | 2.7 in | High |
| Sep | 1.2 in | 5 days | 3.1 in | Critical |
| Oct | 1.2 in | 5 days | 3.1 in | Critical |
| Nov | 0.9 in | 6 days | — | None |
| Dec | 0.9 in | 7 days | — | None |
Annual total: 13.7 in. Water needs vary by crop — tomatoes need ~1.2"/week while herbs like rosemary need only 0.3"/week. Check individual plant pages for crop-specific water budgets that factor in your county's rainfall and soil drainage.
San Juan County Soil Profile
Soil Type
Loam
Soil pH
6.5-7.8
Drainage
Well Drained
Frost Risk Probability
Based on 31 years of NOAA weather station data from 3 stations
Beginners: Plant frost-sensitive crops (tomatoes, peppers, squash) after the "Safe" date on the left. Harvest or cover them before the "Protect by" date on the right. Hardy crops (lettuce, peas, kale) can go in the yellow transition zones.
How to read this table: "Conservative" means you're safe from frost 9 out of 10 years — best for beginners and frost-sensitive crops. "Average year" is the typical date. "Aggressive" means only 1 in 10 years is that warm — experienced gardeners with frost protection can try these dates.
| Planting Strategy | Last Spring Frost | First Fall Frost | Frost-Free Days |
|---|---|---|---|
| Conservative (safest) | May 26 | Oct 28 | 155 days |
| Cautious | May 11 | Oct 16 | 158 days |
| Average year | May 2 | Oct 11 | 162 days |
| Optimistic | Apr 20 | Oct 4 | 167 days |
| Aggressive (risky) | Apr 15 | Sep 21 | 159 days |
Not very — frost dates can vary by ±41 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Gardening Difficulty Score
San Juan County presents some gardening challenges. Choose adapted varieties and plan around frost dates.
Local Gardening Help in San Juan County
Free expert help is closer than you think. Your county's cooperative extension office connects you with trained gardeners, soil testing labs, and local programs — all specific to San Juan County's climate and soil.
County Extension Office
San Juan County Utah State University Extension Extension Office
Phone: 435-797-2200
Visit Extension Office Website →
Extension offices are run by land-grant universities and funded by the USDA. Their advice is free, research-based, and tailored to your county's specific conditions.
Master Gardener Program
Free gardening help from trained volunteers
Master Gardeners are community volunteers who complete 40–60 hours of university horticultural training. They answer gardening questions, diagnose plant problems, and offer workshops — all free.
Many extension offices run a Master Gardener hotline where you can call or email with photos of plant problems for free diagnosis.
Soil Testing
Available through your extension office
Before amending your soil, get it tested. Your extension office offers soil testing (typically $10–$25) that tells you exact pH, nutrient levels, and amendment recommendations specific to what you want to grow.
Services Available in San Juan County
Finding local nurseries & garden centers in San Juan County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to San Juan County's soil and climate that big-box stores can't. Plants from local growers are typically hardier because they're already acclimated to your zone.
How to Find Them
Search for "nurseries near San Juan County UT" or "garden center San Juan County" on Google Maps. Also check with your extension office — they often maintain lists of reputable local nurseries and plant sales.
Community gardens & gardening groups
Community gardens are a great way to learn from experienced gardeners in your area, especially if you're limited on space. Search "community garden San Juan County UT" or check your extension office and local parks department. Facebook groups like "San Juan County Gardeners" or "Utah Gardening" are also excellent for local advice and plant swaps.
What to Plant After Your Harvest
After your first crops finish, use the remaining frost-free days to grow a second round.
Show 6 more succession options
Sunlight & Day Length in San Juan County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Why it matters: Photoperiod-sensitive crops will fail spectacularly if planted at the wrong latitude. Sweet onions in Michigan? Tiny. Spanish onions in Florida? Tiny. Match variety to San Juan County's daylight pattern and you'll see the difference.
Longest Day
14.6 hours
Summer solstice daylight
Shortest Day
9.4 hours
Winter solstice daylight
Peak Sun Hours
10.1 hr/day peak (summer)
Peak sun hours (green dashed line below) account for cloud cover — this is the usable direct sunlight your garden actually receives. Most vegetables need 6+ peak sun hours.
Onion tip: Your long summer days (14+ hours) support long-day onion varieties like Walla Walla, Sweet Spanish, and Ailsa Craig.
View detailed monthly data
| Month | Daylight Hours | Peak Sun Hours | Day Length |
|---|---|---|---|
| January | 9.7 hr | 5.3 hr | Short day |
| February | 10.6 hr | 6 hr | Short day |
| March | 11.7 hr | 7.3 hr | Short day |
| April | 13 hr | 7.5 hr | Neutral |
| May | 14 hr | 8.4 hr | Long day |
| June | 14.6 hr | 10.1 hr | Long day |
| July | 14.4 hr | 9.8 hr | Long day |
| August | 13.5 hr | 9.2 hr | Neutral |
| September | 12.2 hr | 8.4 hr | Neutral |
| October | 11 hr | 7.2 hr | Short day |
| November | 9.9 hr | 5.7 hr | Short day |
| December | 9.4 hr | 5 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in San Juan County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
The practical takeaway: Soil heats slower than air in spring and cools slower in fall. That's why "warm" April air doesn't mean "plant tomatoes" — soil still trails by weeks. San Juan County's monthly soil curve makes the lag visible.
Plant Warm Crops When
Soil reaches 60°F+
Soil warm enough from Jul through Aug.
Best Month to Compost
Aug
Microbial activity peaks when soil is warm.
Active Composting
4 months
Short season — insulate pile or use indoor vermicomposting.
View detailed monthly data
| Month | Soil 4" Deep | Soil 8" Deep | Compost Activity | Time to Finish |
|---|---|---|---|---|
| Jan | 9°F | 16°F | ❄️ Dormant | ~36 weeks |
| Feb | 11°F | 16°F | ❄️ Dormant | ~36 weeks |
| Mar | 16°F | 20°F | ❄️ Dormant | ~36 weeks |
| Apr | 30°F | 30°F | ❄️ Dormant | ~36 weeks |
| May | 44°F | 41°F | 🐢 Slow | ~24 weeks |
| Jun | 55°F | 49°F | ♻️ Active | ~14 weeks |
| Jul | 61°F | 57°F | ♻️ Active | ~14 weeks |
| Aug | 65°F | 60°F | 🔥 Peak | ~8 weeks |
| Sep | 58°F | 55°F | ♻️ Active | ~14 weeks |
| Oct | 43°F | 46°F | 🐢 Slow | ~24 weeks |
| Nov | 28°F | 36°F | ❄️ Dormant | ~36 weeks |
| Dec | 17°F | 24°F | ❄️ Dormant | ~36 weeks |
Highlighted rows = soil 60°F+ (safe for warm-season transplants). Compost finishes fastest during peak activity months.
Pest & Disease Pressure in San Juan County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
The practical takeaway: Warm humid regions cycle through pest generations 3-5x faster than cold dry regions. San Juan County's pest score is your early-warning system: high score means commit to disease-resistant varieties and accept some crop loss to bugs.
Insect Pest Pressure
Moderate — common pests appear but manageable with monitoring.
Disease Risk
Low disease risk — dry conditions reduce fungal problems.
Seasonal Risk
View 6 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Japanese beetles | Moderate | Jun, Jul, Aug |
| Squash bugs | Low | Jun, Jul, Aug |
| Tomato hornworms | Low | Jul, Aug |
| Cabbage loopers | Low | May, Jun, Jul, Aug |
| Slugs | Low | Apr, May, Jun |
Organic pest management tips
- Maintain healthy soil with regular compost additions to build natural pest resistance
- Practice crop rotation annually to break pest cycles
- Encourage beneficial insects with flowering herbs like dill, fennel, and yarrow
Cover Crops for San Juan County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
What this means for you: Cover crops protect microbial life through winter and summer. Bare soil bakes; covered soil stays cooler, moister, and biologically active. The difference shows up in next year's crops.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 11 | Aug 16 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | May 14 | Aug 2 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 3 | Aug 2 | ✓ Yes | Living mulch, fixes nitrogen, permanent ground cover |
Summer Cover Crops (1 options) — Fill gaps and suppress weeds between plantings
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Sunflowers | May 17 | Sep 20 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (6 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Austrian winter peas | Aug 16 | Apr 18 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 17 | Apr 11 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Aug 5 | Apr 11 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 29 | Apr 11 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jul 12 | Apr 18 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jul 21 | Apr 18 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in San Juan County
Quick context: Pollinators avoid windy days. San Juan County's 10.4 mph average wind isn't enough to stop bees and butterflies — but plant fruiting crops (tomatoes, peppers, squash) in protected microclimates and you'll see noticeably better fruit set.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 15 mph Summer: 10 mph
Fall: 13 mph Winter: 15 mph
Prevailing wind: W. Windy area — plant a windbreak hedge on the W side of your garden.
Windbreak Benefit
6.6/10
Moderately beneficial — a simple fence or trellis can protect delicate crops from wind stress.
Frost Pocket Risk
High
Hilly terrain with 1,084 ft of elevation range — cold air pools in low spots. Avoid planting frost-sensitive crops in valleys.
Rainwater Harvesting in San Juan County
How much water you can collect, when to collect it, and what size system you need for your garden.
For new gardeners: Rainwater is unchlorinated, unfluoridated, and at ambient temperature — plants actually prefer it. San Juan County's 14" annual rainfall means even a small 50-gallon barrel catches enough for a few weeks of garden watering between storms.
Annual Collection
6,828 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
8 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 2,000 gal tank.
Legal Status
Limited
Your state has quantity limits on rainwater collection — check local regulations before installing large systems.
Best Collection Months
Apr, May, Aug, Sep
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Feb, Nov, Dec
Dry months when you'll rely on stored water — size your storage for this gap.
Rainwater collection tips for your area
- Your county receives approximately 13.7 inches of rain per year
- A 1,000 sq ft roof can collect roughly 6,828 gallons annually
- Check UT state regulations — rainwater harvesting has quantity limits
- In your dry climate, every drop counts — consider a larger cistern system
- Position collection tanks in shade to reduce evaporation and algae growth
Soil & Growing Conditions in San Juan County
Soil Type
Loam
Soil pH 6.5–7.8 · Well Drained drainage
Good candidate for raised beds to maximise drainage and extend the season.
Watering Needs
Drought stress: 5.5/10
Moderate drought pressure. Drip irrigation and mulching are highly recommended to maintain soil moisture through summer.
Season Tips
162-day frost-free season
Start warm-season crops indoors and focus on short-season varieties. Cold frames extend your season by 3–4 weeks in fall.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 22-page printable includes your zone's planting calendar, a month-by-month task list, a seed inventory tracker, a harvest log, and succession-planting charts. Built to print, write in, and actually use all season.
Recommended for Your Garden
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Get instant, accurate soil pH readings to fine-tune your amendments.
Boost soil fertility and structure with rich, well-aged organic compost.
🥬 Vegetables to Grow in San Juan County
112 vegetables that grow well in Zone 7a with planting dates for San Juan County.
Show all 112 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Apr 4 | May 9 | May 16 | — | Aug 8 – Sep 12 | 80–100 |
| Amaranth | Mar 14 | May 9 | May 16 | — | Aug 15 – Oct 3 | 90–120 |
| Artichoke | — | — | May 16 | — | Sep 19 – Nov 28 | 120–180 |
| Arugula | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 6 – Aug 8 | 30–50 |
| Asparagus | — | — | May 16 | — | — | 730–1095 |
| Beets | — | Apr 18 | — | Aug 2 | Jun 13 – Jul 11 | 50–70 |
| Belgian Endive | Mar 28 | Apr 18 | May 2 | Aug 2 | Aug 22 – Oct 17 | 110–150 |
| Bitter Melon | Mar 14 | May 9 | May 16 | — | Jul 18 – Aug 29 | 60–90 |
| Black Beans | — | May 9 | — | — | Aug 8 – Sep 26 | 90–120 |
| Bok Choy | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 13 – Jul 18 | 40–60 |
| Broccoli | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 4 – Aug 15 | 60–90 |
| Broccoli Rabe | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 13 – Jul 18 | 40–60 |
| Brussels Sprouts | Mar 28 | Apr 18 | May 2 | Aug 2 | Aug 1 – Sep 26 | 90–130 |
| Butternut Squash | Apr 4 | May 9 | May 16 | — | Aug 15 – Sep 19 | 85–110 |
| Cabbage | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 4 – Aug 29 | 60–100 |
| Calabash | Mar 14 | May 9 | May 16 | — | Aug 8 – Oct 3 | 80–120 |
| Cardoon | — | — | May 16 | — | Sep 19 – Oct 31 | 120–150 |
| Carrots | — | Apr 18 | — | Aug 2 | Jun 20 – Jul 25 | 60–80 |
| Cauliflower | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Aug 29 | 55–100 |
| Celeriac | Mar 28 | Apr 18 | May 2 | Aug 2 | Aug 15 – Sep 19 | 100–120 |
| Celery | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 25 – Sep 19 | 80–120 |
| Celtuce | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 4 – Aug 15 | 60–90 |
| Chard | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Aug 15 | 50–60 |
| Chayote | Mar 14 | May 9 | May 16 | — | Sep 19 – Nov 28 | 120–180 |
| Chickpeas | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 25 – Sep 5 | 80–110 |
| Chicory | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 4 – Aug 15 | 60–85 |
| Chinese Cabbage | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Jul 25 | 50–70 |
| Christmas Lima Beans | Mar 14 | May 9 | May 16 | — | Aug 8 – Sep 12 | 80–100 |
| Collard Greens | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Aug 29 | 55–75 |
| Corn | — | May 9 | — | — | Jul 11 – Sep 5 | 60–100 |
| Cowpeas | — | May 9 | — | — | Jul 11 – Aug 22 | 60–90 |
| Cress | Mar 28 | Apr 18 | May 2 | Aug 2 | May 16 – Jun 6 | 14–21 |
| Crookneck Squash | Apr 4 | May 9 | May 16 | — | Jul 4 – Aug 1 | 45–60 |
| Crosne | — | Apr 18 | — | Aug 2 | Sep 19 – Nov 21 | 150–200 |
| Cucumber | Apr 4 | May 9 | May 16 | — | Jul 11 – Sep 5 | 50–70 |
| Daikon | — | Apr 18 | — | Aug 2 | Jun 13 – Jul 11 | 50–70 |
| Delicata Squash | Apr 4 | May 9 | May 16 | — | Aug 8 – Sep 12 | 80–100 |
| Edamame | — | May 9 | — | — | Jul 25 – Sep 5 | 75–100 |
| Eggplant | Feb 28 | May 9 | May 16 | — | Jul 25 – Sep 26 | 65–85 |
| Endive | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 20 – Jul 25 | 45–65 |
| Escarole | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Jul 25 | 50–70 |
| Fava Beans | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 18 – Aug 29 | 75–100 |
| Fennel | Mar 14 | May 9 | May 16 | — | Jul 18 – Aug 29 | 60–90 |
| Garlic | — | — | — | Aug 30 | Nov 29 – Apr 11 | 90–240 |
| Green Beans | — | May 9 | — | — | Jul 4 – Aug 29 | 50–65 |
| Horseradish | — | — | May 16 | — | Sep 19 – Nov 28 | 120–180 |
| Hot Peppers | Feb 28 | May 9 | May 16 | — | Jul 25 – Oct 31 | 70–120 |
| Hubbard Squash | Apr 4 | May 9 | May 16 | — | Aug 29 – Oct 3 | 100–120 |
| Jicama | Mar 14 | May 9 | May 16 | — | Sep 19 – Nov 28 | 120–180 |
| Kabocha | Apr 4 | May 9 | May 16 | — | Aug 15 – Sep 12 | 85–100 |
| Kai Lan | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 20 – Jul 18 | 45–60 |
| Kale | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Aug 22 | 50–70 |
| Kidney Beans | — | May 9 | — | — | Aug 8 – Sep 12 | 85–110 |
| Kohlrabi | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 20 – Jul 25 | 45–65 |
| Komatsuna | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 6 – Jul 11 | 35–50 |
| Leeks | Mar 28 | Apr 18 | May 2 | Aug 2 | Aug 1 – Oct 17 | 90–150 |
| Lentils | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 25 – Sep 5 | 80–110 |
| Lettuce | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 6 – Aug 15 | 30–60 |
| Lima Beans | — | May 9 | — | — | Jul 11 – Aug 22 | 60–90 |
| Loofah | Mar 14 | May 9 | May 16 | — | Aug 29 – Oct 31 | 100–150 |
| Luffa | Mar 14 | May 9 | May 16 | — | Aug 15 – Oct 31 | 90–150 |
| Mache | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 13 – Jul 18 | 40–60 |
| Malabar Spinach | Mar 14 | May 9 | May 16 | — | Jul 11 – Aug 8 | 55–70 |
| Melon | Apr 4 | May 9 | May 16 | — | Jul 25 – Sep 12 | 70–100 |
| Microgreens | Mar 28 | Apr 18 | May 2 | Aug 2 | May 9 – Jun 6 | 7–21 |
| Mitsuba | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 20 – Aug 15 | 50–70 |
| Mizuna | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 6 – Jul 4 | 30–45 |
| Mustard Greens | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 6 – Aug 8 | 30–50 |
| Napa Cabbage | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Aug 1 | 55–75 |
| New Zealand Spinach | Mar 14 | May 9 | May 16 | — | Jul 11 – Aug 8 | 55–70 |
| Okra | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 5 | 50–65 |
| Onion | Mar 28 | Apr 18 | May 2 | Aug 2 | Aug 1 – Sep 19 | 90–120 |
| Pac Choi | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 13 – Jul 11 | 40–55 |
| Parsnip | — | Apr 18 | — | Aug 2 | Aug 1 – Sep 12 | 100–130 |
| Patty Pan Squash | Apr 4 | May 9 | May 16 | — | Jul 4 – Aug 1 | 45–60 |
| Peas | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Aug 22 | 55–70 |
| Peppers | Feb 28 | May 9 | May 16 | — | Jul 18 – Sep 26 | 60–90 |
| Pole Beans | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 5 | 55–70 |
| Potatoes | Mar 14 | May 9 | May 16 | — | Jul 25 – Oct 3 | 70–120 |
| Pumpkin | Apr 4 | May 9 | May 16 | — | Aug 15 – Oct 3 | 85–120 |
| Purslane | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 13 – Jul 18 | 40–60 |
| Radicchio | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 4 – Aug 8 | 60–80 |
| Radish | — | Apr 18 | — | Aug 2 | May 16 – Jun 6 | 22–35 |
| Rhubarb | — | — | May 23 | — | — | 365–730 |
| Romanesco | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 18 – Aug 29 | 75–100 |
| Rutabaga | — | Apr 18 | — | Aug 2 | Jul 11 – Aug 15 | 80–100 |
| Salsify | — | Apr 18 | — | Aug 2 | Aug 1 – Sep 12 | 100–130 |
| Savoy Cabbage | Mar 28 | Apr 18 | May 2 | Aug 2 | Jul 11 – Sep 5 | 70–110 |
| Scallions | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Jul 25 | 50–70 |
| Scarlet Runner Beans | Mar 14 | May 9 | May 16 | — | Jul 18 – Aug 22 | 60–80 |
| Shallot | Mar 28 | Apr 18 | May 2 | Aug 2 | Aug 1 – Sep 19 | 90–120 |
| Shiso | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 5 | 50–70 |
| Snap Peas | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 5 | 55–70 |
| Snow Peas | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 27 – Aug 22 | 50–65 |
| Soybeans | — | May 9 | — | — | Aug 1 – Sep 26 | 80–120 |
| Spaghetti Squash | Apr 4 | May 9 | May 16 | — | Aug 15 – Sep 12 | 85–100 |
| Spinach | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 6 – Aug 8 | 35–50 |
| Squash (Summer) | Apr 4 | May 9 | May 16 | — | Jul 4 – Sep 5 | 45–65 |
| Squash (Winter) | Apr 4 | May 9 | May 16 | — | Aug 8 – Oct 3 | 80–120 |
| Sunchoke | — | — | May 16 | — | Sep 5 – Oct 31 | 110–150 |
| Sweet Corn | — | May 9 | — | — | Jul 11 – Aug 22 | 60–90 |
| Sweet Potatoes | Mar 14 | May 9 | May 16 | — | Aug 15 – Oct 3 | 90–120 |
| Tatsoi | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 6 – Jul 11 | 35–50 |
| Tomatillo | Mar 14 | May 9 | May 16 | — | Jul 18 – Sep 26 | 60–85 |
| Tomatoes | Mar 14 | May 9 | May 16 | — | Jul 18 – Sep 26 | 60–85 |
| Turnip | — | Apr 18 | — | Aug 2 | May 30 – Jul 4 | 40–60 |
| Watercress | Mar 28 | Apr 18 | May 2 | Aug 2 | Jun 13 – Jul 18 | 40–60 |
| Watermelon | Apr 4 | May 9 | May 16 | — | Jul 25 – Sep 12 | 70–100 |
| Wax Beans | — | May 9 | — | — | Jul 4 – Aug 29 | 50–65 |
| Winter Melon | Mar 14 | May 9 | May 16 | — | Aug 15 – Oct 3 | 90–120 |
| Yard Long Beans | Mar 14 | May 9 | May 16 | — | Jul 11 – Aug 22 | 55–80 |
| Zucchini | Apr 4 | May 9 | May 16 | — | Jul 4 – Aug 29 | 45–60 |
🍓 Fruits to Grow in San Juan County
31 fruits that grow well in Zone 7a with planting dates for San Juan County.
Show all 31 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | May 23 | — | Aug 22 – Dec 5 | 90–180 |
| Aronia | — | — | May 23 | — | — | 730–1095 |
| Blackberries | — | — | May 23 | — | — | 365–730 |
| Blueberries | — | — | May 23 | — | — | 730–1095 |
| Boysenberries | — | — | May 23 | — | — | 365–730 |
| Cantaloupe | — | — | May 23 | — | Aug 1 – Sep 5 | 70–90 |
| Che Fruit | — | — | May 23 | — | — | 1095–1825 |
| Cranberries | — | — | May 23 | — | — | 730–1095 |
| Currants | — | — | May 23 | — | — | 730–1095 |
| Elderberries | — | — | May 23 | — | — | 730–1095 |
| Figs | — | — | May 23 | — | — | 730–1825 |
| Goji Berries | — | — | May 23 | — | — | 730–1095 |
| Gooseberries | — | — | May 23 | — | — | 730–1095 |
| Grapes | — | — | May 23 | — | — | 730–1095 |
| Ground Cherry | — | — | May 23 | — | Aug 1 – Sep 26 | 65–80 |
| Hardy Kiwi | — | — | May 23 | — | — | 1095–1825 |
| Haskaps | — | — | May 23 | — | — | 730–1095 |
| Honeydew | — | — | May 23 | — | Aug 15 – Sep 26 | 80–110 |
| Jostaberry | — | — | May 23 | — | — | 730–1095 |
| Kiwi | — | — | May 23 | — | — | 1095–1825 |
| Lingonberries | — | — | May 23 | — | — | 730–1095 |
| Loquat | — | — | May 23 | — | — | 730–1825 |
| Medlar | — | — | May 23 | — | — | 1095–1825 |
| Mulberries | — | — | May 23 | — | — | 730–1825 |
| Pawpaw | — | — | May 23 | — | — | 1095–2555 |
| Persimmon | — | — | May 23 | — | — | 1095–2555 |
| Pomegranate | — | — | May 23 | — | — | 730–1095 |
| Quince | — | — | May 23 | — | — | 1095–1825 |
| Raspberries | — | — | May 23 | — | — | 365–730 |
| Serviceberries | — | — | May 23 | — | — | 730–1095 |
| Strawberries | — | — | May 23 | — | Aug 22 – Jan 2 | 90–365 |
🌿 Herbs to Grow in San Juan County
36 herbs that grow well in Zone 7a with planting dates for San Juan County.
Show all 36 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Mar 28 | Apr 18 | Apr 25 | Aug 2 | — | 365–730 |
| Anise | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jul 25 – Oct 10 | 90–120 |
| Basil | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 12 | 50–75 |
| Bee Balm | — | — | May 9 | — | Aug 8 – Oct 24 | 90–120 |
| Borage | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 20 – Aug 8 | 50–60 |
| Caraway | Mar 28 | Apr 18 | Apr 25 | Aug 2 | — | 365–450 |
| Catnip | — | — | May 9 | — | Jul 11 – Sep 12 | 60–80 |
| Chamomile | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 27 – Sep 5 | 60–90 |
| Chervil | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 6 – Aug 8 | 40–60 |
| Chives | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Cilantro | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 6 – Aug 8 | 40–60 |
| Comfrey | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Cumin | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Aug 8 – Oct 10 | 100–120 |
| Dill | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 6 – Aug 8 | 40–60 |
| Epazote | Mar 14 | May 9 | May 16 | — | Jul 4 – Aug 29 | 45–60 |
| Fennel (herb) | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 27 – Sep 5 | 60–90 |
| Feverfew | — | — | May 9 | — | Aug 8 – Oct 24 | 90–120 |
| Garlic Chives | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Horehound | — | — | May 9 | — | Jul 25 – Sep 19 | 75–90 |
| Hyssop | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Lemon Balm | — | — | May 9 | — | Jul 11 – Aug 29 | 60–70 |
| Lemon Thyme | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Lovage | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Marjoram | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Mint | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Oregano | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Parsley | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 27 – Aug 29 | 60–80 |
| Rosemary | — | — | May 9 | — | Aug 1 – Dec 19 | 80–180 |
| Rue | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Sage | — | — | May 9 | — | Jul 25 – Sep 19 | 75–90 |
| Savory | — | — | May 9 | — | Jul 4 – Aug 29 | 50–70 |
| Sorrel | Mar 28 | Apr 18 | Apr 25 | Aug 2 | Jun 6 – Aug 8 | 40–60 |
| Tarragon | — | — | May 9 | — | Jul 11 – Sep 19 | 60–90 |
| Thai Basil | Mar 14 | May 9 | May 16 | — | Jul 11 – Sep 12 | 50–75 |
| Thyme | — | — | May 9 | — | Jul 18 – Sep 19 | 70–90 |
| Valerian | — | — | May 9 | — | Sep 12 – Dec 19 | 120–180 |
🌸 Flowers to Grow in San Juan County
53 flowers that grow well in Zone 7a with planting dates for San Juan County.
Show all 53 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Mar 21 | May 2 | May 2 | — | Jun 27 – Oct 17 | 60–75 |
| Alliums | — | — | — | Sep 6 | Oct 4 – Oct 25 | 28–42 |
| Anemones | — | — | — | Aug 16 | Aug 30 – Sep 27 | 90–120 |
| Astilbe | Feb 28 | — | May 9 | — | Jul 18 – Sep 12 | 70–100 |
| Bachelor's Button | Mar 21 | Mar 28 | May 2 | Aug 16 | Jul 4 – Oct 3 | 60–90 |
| Begonias | Feb 21 | — | May 2 | — | Jul 11 – Oct 31 | 70–90 |
| Black-eyed Susan | Feb 28 | May 2 | May 9 | — | Jul 18 – Nov 21 | 60–80 |
| Bleeding Hearts | Feb 28 | — | May 9 | — | Jun 27 – Aug 1 | 60–90 |
| Calendula | Mar 21 | Mar 28 | May 2 | Aug 16 | Jun 20 – Oct 3 | 50–70 |
| California Poppy | — | Apr 4 | — | Aug 16 | Jun 13 – Aug 22 | 60–90 |
| Celosia | Apr 4 | May 2 | May 2 | — | Jul 4 – Oct 31 | 60–90 |
| Columbine | Mar 7 | May 9 | May 9 | — | Jun 27 – Aug 1 | 70–100 |
| Coreopsis | Feb 28 | May 2 | May 9 | — | Jul 11 – Nov 21 | 60–80 |
| Cosmos | Apr 4 | May 2 | May 2 | — | Jul 11 – Oct 31 | 60–90 |
| Crocus | — | — | — | Sep 6 | Aug 2 – Aug 23 | 10–20 |
| Daffodils | — | — | — | Sep 6 | Aug 9 – Aug 30 | 20–40 |
| Dahlias | Apr 4 | May 9 | May 9 | — | Jul 18 – Nov 21 | 70–120 |
| Daylily | Feb 28 | — | May 9 | — | Jul 18 – Nov 21 | 60–90 |
| Dianthus | Mar 7 | Mar 28 | Apr 11 | — | May 30 – Aug 29 | 60–80 |
| Echinacea (Purple Coneflower) | Feb 28 | May 9 | May 9 | — | Jul 25 – Nov 21 | 70–90 |
| Foxglove | Mar 7 | May 9 | May 9 | — | Jun 27 – Aug 1 | 80–120 |
| Gaillardia (Blanket Flower) | Mar 14 | May 9 | May 9 | — | Jul 18 – Dec 5 | 70–100 |
| Geraniums | Feb 21 | — | May 2 | — | Jul 11 – Oct 31 | 70–100 |
| Gladiolus | — | May 2 | May 2 | — | Jul 11 – Nov 14 | 70–100 |
| Hostas | Feb 21 | — | May 9 | — | Jul 18 – Nov 21 | 60–90 |
| Hyacinths | — | — | — | Sep 6 | Aug 30 – Sep 20 | 14–28 |
| Hydrangeas | Feb 21 | — | May 9 | — | Jul 18 – Nov 7 | 90–150 |
| Impatiens | Mar 7 | — | May 9 | — | Jul 18 – Nov 7 | 60–75 |
| Irises | — | Division | May 9 | — | Jun 27 – Aug 1 | 60–100 |
| Larkspur | — | Apr 4 | — | Aug 2 | Jun 13 – Aug 22 | 60–90 |
| Lavender | Feb 28 | — | May 16 | — | Jul 25 – Oct 3 | 90–120 |
| Lilies | — | Division | May 9 | — | Jul 18 – Nov 7 | 70–120 |
| Lobelia | Feb 28 | — | Apr 11 | — | Jun 6 – Aug 29 | 70–80 |
| Lupine | Mar 7 | May 9 | May 9 | — | Jun 27 – Aug 1 | 75–100 |
| Marigolds | Mar 21 | May 2 | May 2 | — | Jun 27 – Oct 3 | 50–70 |
| Nasturtium | Apr 4 | May 2 | May 2 | — | Jun 27 – Oct 31 | 55–65 |
| Pansy | Feb 21 | — | May 2 | Aug 2 | Jun 27 – Sep 5 | 70–90 |
| Peonies | — | Division | May 9 | — | Jul 4 – Aug 8 | 90–120 |
| Petunia | Mar 7 | — | May 9 | — | Jul 18 – Nov 7 | 70–90 |
| Phlox | Feb 28 | May 9 | May 9 | — | Jul 18 – Oct 10 | 80–110 |
| Portulaca | Apr 4 | May 2 | May 2 | — | Jun 20 – Oct 17 | 50–70 |
| Ranunculus | — | — | — | Aug 16 | Sep 13 – Oct 11 | 90–120 |
| Roses | Feb 21 | — | May 9 | — | Jul 18 – Nov 21 | 90–180 |
| Salvia | Mar 7 | — | May 2 | — | Jul 11 – Oct 31 | 70–90 |
| Sedum (Stonecrop) | Feb 28 | — | May 9 | — | Aug 29 – Nov 21 | 60–90 |
| Snapdragon | Feb 21 | Apr 4 | May 2 | Aug 16 | Jul 11 – Oct 3 | 70–100 |
| Sunflower | Apr 11 | May 2 | May 2 | — | Jul 25 – Oct 31 | 70–100 |
| Sweet Alyssum | Mar 21 | Apr 4 | May 2 | Aug 30 | Jun 13 – Sep 5 | 45–60 |
| Sweet Pea | — | Mar 28 | — | Aug 16 | Jun 6 – Aug 29 | 65–85 |
| Tulips | — | — | — | Sep 6 | Aug 23 – Sep 13 | 15–30 |
| Vinca (Annual) | Feb 21 | — | May 2 | — | Jul 11 – Oct 31 | 70–90 |
| Yarrow | Feb 28 | May 2 | May 9 | — | Jul 11 – Nov 21 | 60–90 |
| Zinnia | Apr 4 | May 2 | May 2 | — | Jul 11 – Oct 31 | 60–70 |
Monthly Planting Guide for San Juan County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in San Juan County.
Frequently Asked Questions
What planting zone is San Juan County, UT?
San Juan County is in USDA Hardiness Zone 7a. This zone classification determines which perennial plants survive winter and sets the baseline for frost timing across the county.
When is the last frost in San Juan County, UT?
Based on 31 years of NOAA weather station data, the median last spring frost in San Juan County falls around May 2. In 8 out of 10 years, last frost lands between April 15 and May 26 — a 41-day window of variability. Use May 26 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in San Juan County, UT?
The median first fall frost in San Juan County arrives around October 11. In cold years it can arrive as early as September 21; in mild years as late as October 28. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in San Juan County?
San Juan County has a frost-free growing season of approximately 162 days. This is enough time for most warm-season crops including tomatoes, peppers, and squash with proper timing.
What is the soil like in San Juan County for gardening?
San Juan County has predominantly Loam soil with a pH range of 6.5–7.8 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in San Juan County?
San Juan County has commercial agriculture that includes Hay, Cattle, Wheat, Sugar Beets. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is San Juan County a good location for home gardening?
San Juan County scores 46/100 (Moderate) on our Microclimate Index, which combines frost reliability, drought pressure, soil challenge, elevation risk, and long-term climate trend. Gardening here benefits from close attention to frost timing and season extension due to the challenging microclimate factors.
Your San Juan County Garden Planner — Free
A 22-page printable planner built for San Juan County (Zone 7a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Seed Saving & Storage Guide
Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.
- 200 plants, step-by-step: life cycle, pollination type, isolation
- Exact temperature + humidity ranges that keep seeds viable
- Bonus: searchable Google Sheets tracker + custom GPT assistant
Composting Guide for Homesteaders
Turn kitchen scraps and yard waste into compost that actually feeds the garden — instead of a pile that smells, attracts pests, and never breaks down.
- 14 sections on composting methods, soil science, and troubleshooting
- The 7-step hot-compost system from start to finish
- Bonus tools: troubleshooting chart, safety guide, monitoring log