Garfield County, CO — Planting Guide
Garfield County, Colorado gardeners: here's your May plan
Your garden in Garfield County, Colorado is working on a schedule, even when you're not. Here's where you should be this May.
-
Set out kale, lettuce, and angelica seedlings
Bring a watering can to the bed. Each transplant gets a drink the moment it's in the ground, not ten minutes later.
-
Outdoor sowing time: carrots, kale, and lettuce
Mark the row. Birds and stray feet both have opinions about unmarked beds.
June will be here before you know it — start on
- Transplants going out: basil, cucumber, and peppers
- Direct-sowing: basil, cucumber, and green beans
- Starting indoors: cucumber, kale, and lettuce
- First harvests: lettuce, radish, and arugula
Garfield County is in USDA Zone 6a. The average last spring frost is May 25 and the first fall frost is September 21, giving you a growing season of approximately 119 days.
At an elevation of 7,997 ft, Garfield County receives approximately 21.3 in of rainfall annually. Summer highs average 84°F with winter lows around 17°F. The predominant soil type is Loam.
Based on 31 years of NOAA climate station data, the last frost date here varies by 43 days year to year — ranging from May 2 in warm years to June 14 in cold years. The growing season is trending shorter by about 6.31 days per decade. Garfield County scores 33/100 (Challenging) on the Microclimate Index.
🌡️ Zone
6a (°F to °F min)
❄️ Last Frost
May 25
🍂 First Frost
September 21
📅 Growing Season
119 days
⛰️ Elevation
7,997 ft
🌧️ Annual Rainfall
21.3 in
Monthly Watering Calendar
When you'll need to water your garden — based on average monthly rainfall vs. the ~1 inch/week most gardens need.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.5 in | 6 days | — | None |
| Feb | 1.3 in | 6 days | — | None |
| Mar | 1.6 in | 8 days | — | None |
| Apr | 2.5 in | 8 days | 1.8 in | High |
| May | 2.6 in | 7 days | 1.7 in | High |
| Jun | 1.4 in | 4 days | 2.9 in | High |
| Jul | 1.8 in | 6 days | 2.5 in | High |
| Aug | 2.2 in | 7 days | 2.1 in | High |
| Sep | 1.8 in | 5 days | 2.5 in | High |
| Oct | 1.7 in | 5 days | 2.6 in | High |
| Nov | 1.6 in | 6 days | — | None |
| Dec | 1.2 in | 7 days | — | None |
Annual total: 21.2 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.
Garfield County Soil Profile
Soil Type
Loam
Soil pH
6.5-7.9
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) | Jun 14 | Oct 8 | 116 days |
| Cautious | Jun 4 | Oct 1 | 119 days |
| Average year | May 25 | Sep 21 | 119 days |
| Optimistic | May 14 | Sep 14 | 123 days |
| Aggressive (risky) | May 2 | Sep 2 | 123 days |
Not very — frost dates can vary by ±43 days year-to-year. Use the "Conservative" row in the table below, and keep row covers handy for surprise late frosts.
Yes — growing seasons are getting shorter here (about 6.3 days per decade). Use the "Conservative" dates and choose fast-maturing varieties.
Gardening Difficulty Score
Garfield County has challenging growing conditions. Season extension and careful variety selection are essential.
Local Gardening Help in Garfield 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 Garfield County's climate and soil.
County Extension Office
Garfield County Colorado State University Extension Extension Office
Phone: 970-491-6281
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 Garfield County
Finding local nurseries & garden centers in Garfield County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Garfield 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 Garfield County CO" or "garden center Garfield 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 Garfield County CO" or check your extension office and local parks department. Facebook groups like "Garfield County Gardeners" or "Colorado 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.
Sunlight & Day Length
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Longest Day
14.8 hours
Summer solstice daylight
Shortest Day
9.2 hours
Winter solstice daylight
Peak Sun Hours
10.7 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 | 9.5 hr | 5.2 hr | Short day |
| February | 10.5 hr | 6 hr | Short day |
| March | 11.7 hr | 7.2 hr | Short day |
| April | 13.1 hr | 7.9 hr | Neutral |
| May | 14.2 hr | 8.4 hr | Long day |
| June | 14.8 hr | 10.7 hr | Long day |
| July | 14.5 hr | 10.5 hr | Long day |
| August | 13.6 hr | 9.3 hr | Neutral |
| September | 12.2 hr | 8.6 hr | Neutral |
| October | 10.9 hr | 7 hr | Short day |
| November | 9.8 hr | 5.5 hr | Short day |
| December | 9.2 hr | 4.9 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting Calendar
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Plant Warm Crops When
Soil reaches 60°F+
Soil rarely reaches 60°F — use black plastic mulch to warm soil.
Best Month to Compost
Jul
Microbial activity peaks when soil is warm.
Active Composting
2 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 | -1°F | 7°F | ❄️ Dormant | ~36 weeks |
| Feb | 0°F | 7°F | ❄️ Dormant | ~36 weeks |
| Mar | 6°F | 11°F | ❄️ Dormant | ~36 weeks |
| Apr | 22°F | 21°F | ❄️ Dormant | ~36 weeks |
| May | 35°F | 30°F | ❄️ Dormant | ~36 weeks |
| Jun | 44°F | 39°F | 🐢 Slow | ~24 weeks |
| Jul | 52°F | 48°F | ♻️ Active | ~14 weeks |
| Aug | 54°F | 50°F | ♻️ Active | ~14 weeks |
| Sep | 47°F | 45°F | 🐢 Slow | ~24 weeks |
| Oct | 32°F | 35°F | ❄️ Dormant | ~36 weeks |
| Nov | 20°F | 25°F | ❄️ Dormant | ~36 weeks |
| Dec | 6°F | 15°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 Garfield County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
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 | Moderate | Jul, Aug |
| Cabbage loopers | Moderate | 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 Garfield County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with county-specific planting dates.
Spring Cover Crops (3 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | May 27 | Jul 20 | — | Rapid growth, attracts pollinators, suppresses weeds |
| Sorghum-sudan grass | Jun 3 | Jul 20 | — | Massive biomass, breaks compaction, suppresses nematodes |
| White clover | Apr 29 | Jul 13 | ✓ 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 | Jun 15 | Aug 24 | — | 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 | Jul 14 | May 11 | ✓ Yes | Fixes nitrogen, good for heavy clay soils |
| Daikon radish | Aug 10 | May 11 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jun 28 | May 11 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 26 | May 4 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 22 | May 4 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 14 | May 11 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 15 mph Summer: 11 mph
Fall: 13 mph Winter: 16 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 1,955 ft of elevation range — cold air pools in low spots. Avoid planting frost-sensitive crops in valleys.
Rainwater Harvesting Potential
How much water you can collect, when to collect it, and what size system you need for your garden.
Annual Collection
10,566 gal
Per 1,000 sq ft of roof area (at 80% collection efficiency)
Recommended Setup
7 rain barrels (55 gal each)
For a typical 500 sq ft garden. Serious collectors: consider a 1,750 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, Jul, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
Feb, Jun, 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 21.2 inches of rain per year
- A 1,000 sq ft roof can collect roughly 10,566 gallons annually
- Check CO state regulations — rainwater harvesting has quantity limits
- Stock up on stored water before your dry season (Feb, Jun, Dec)
- Use a first-flush diverter to keep roof debris out of your collection
Soil & Growing Conditions in Garfield County
Soil Type
Loam
Soil pH 6.5–7.9 · Moderately 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
119-day frost-free season
A short season means indoor starts are critical for warm-season crops. Prioritise cold-hardy, fast-maturing varieties and use row covers to extend autumn harvests.
Your Free Printable Garden Planner
Plan every bed, every planting, every harvest — in one place. This 24-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 Garfield County
108 vegetables that grow well in Zone 6a with planting dates for Garfield County.
Show all 108 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Acorn Squash | Apr 20 | Jun 1 | Jun 8 | Aug 31 – Oct 5 | 80–100 |
| Amaranth | Mar 30 | Jun 1 | Jun 8 | Sep 7 – Oct 26 | 90–120 |
| Arugula | Apr 20 | May 11 | May 25 | Jun 29 – Aug 31 | 30–50 |
| Asparagus | — | — | Jun 8 | — | 730–1095 |
| Beets | — | May 11 | — | Jul 6 – Aug 3 | 50–70 |
| Belgian Endive | Apr 20 | May 11 | May 25 | Sep 14 – Nov 9 | 110–150 |
| Bitter Melon | Mar 30 | Jun 1 | Jun 8 | Aug 10 – Sep 21 | 60–90 |
| Black Beans | — | Jun 1 | — | Aug 31 – Oct 19 | 90–120 |
| Bok Choy | Apr 20 | May 11 | May 25 | Jul 6 – Aug 10 | 40–60 |
| Broccoli | Apr 20 | May 11 | May 25 | Jul 27 – Sep 7 | 60–90 |
| Broccoli Rabe | Apr 20 | May 11 | May 25 | Jul 6 – Aug 10 | 40–60 |
| Brussels Sprouts | Apr 20 | May 11 | May 25 | Aug 24 – Oct 19 | 90–130 |
| Butternut Squash | Apr 20 | Jun 1 | Jun 8 | Sep 7 – Oct 12 | 85–110 |
| Cabbage | Apr 20 | May 11 | May 25 | Jul 27 – Sep 21 | 60–100 |
| Calabash | Mar 30 | Jun 1 | Jun 8 | Aug 31 – Oct 26 | 80–120 |
| Carrots | — | May 11 | — | Jul 13 – Aug 17 | 60–80 |
| Cauliflower | Apr 20 | May 11 | May 25 | Jul 20 – Sep 21 | 55–100 |
| Celeriac | Apr 20 | May 11 | May 25 | Sep 7 – Oct 12 | 100–120 |
| Celery | Apr 20 | May 11 | May 25 | Aug 17 – Oct 12 | 80–120 |
| Celtuce | Apr 20 | May 11 | May 25 | Jul 27 – Sep 7 | 60–90 |
| Chard | Apr 20 | May 11 | May 25 | Jul 20 – Sep 7 | 50–60 |
| Chickpeas | Apr 20 | May 11 | May 25 | Aug 17 – Sep 28 | 80–110 |
| Chicory | Apr 20 | May 11 | May 25 | Jul 27 – Sep 7 | 60–85 |
| Chinese Cabbage | Apr 20 | May 11 | May 25 | Jul 20 – Aug 17 | 50–70 |
| Christmas Lima Beans | Mar 30 | Jun 1 | Jun 8 | Aug 31 – Oct 5 | 80–100 |
| Collard Greens | Apr 20 | May 11 | May 25 | Jul 20 – Sep 21 | 55–75 |
| Corn | — | Jun 1 | — | Aug 3 – Sep 28 | 60–100 |
| Cowpeas | — | Jun 1 | — | Aug 3 – Sep 14 | 60–90 |
| Cress | Apr 20 | May 11 | May 25 | Jun 8 – Jun 29 | 14–21 |
| Crookneck Squash | Apr 20 | Jun 1 | Jun 8 | Jul 27 – Aug 24 | 45–60 |
| Crosne | — | May 11 | — | Oct 12 – Nov 23 | 150–200 |
| Cucumber | Apr 20 | Jun 1 | Jun 8 | Aug 3 – Sep 28 | 50–70 |
| Daikon | — | May 11 | — | Jul 6 – Aug 3 | 50–70 |
| Delicata Squash | Apr 20 | Jun 1 | Jun 8 | Aug 31 – Oct 5 | 80–100 |
| Edamame | — | Jun 1 | — | Aug 17 – Sep 28 | 75–100 |
| Eggplant | Mar 16 | Jun 1 | Jun 8 | Aug 17 – Oct 19 | 65–85 |
| Endive | Apr 20 | May 11 | May 25 | Jul 13 – Aug 17 | 45–65 |
| Escarole | Apr 20 | May 11 | May 25 | Jul 20 – Aug 17 | 50–70 |
| Fava Beans | Apr 20 | May 11 | May 25 | Aug 10 – Sep 21 | 75–100 |
| Fennel | Mar 30 | Jun 1 | Jun 8 | Aug 10 – Sep 21 | 60–90 |
| Garlic | — | — | — | — | 90–240 |
| Green Beans | — | Jun 1 | — | Jul 27 – Sep 21 | 50–65 |
| Horseradish | — | — | Jun 8 | Oct 12 – Dec 21 | 120–180 |
| Hot Peppers | Mar 16 | Jun 1 | Jun 8 | Aug 17 – Nov 23 | 70–120 |
| Hubbard Squash | Apr 20 | Jun 1 | Jun 8 | Sep 21 – Oct 26 | 100–120 |
| Kabocha | Apr 20 | Jun 1 | Jun 8 | Sep 7 – Oct 5 | 85–100 |
| Kai Lan | Apr 20 | May 11 | May 25 | Jul 13 – Aug 10 | 45–60 |
| Kale | Apr 20 | May 11 | May 25 | Jul 20 – Sep 14 | 50–70 |
| Kidney Beans | — | Jun 1 | — | Aug 31 – Oct 5 | 85–110 |
| Kohlrabi | Apr 20 | May 11 | May 25 | Jul 13 – Aug 17 | 45–65 |
| Komatsuna | Apr 20 | May 11 | May 25 | Jun 29 – Aug 3 | 35–50 |
| Leeks | Apr 20 | May 11 | May 25 | Aug 24 – Nov 9 | 90–150 |
| Lentils | Apr 20 | May 11 | May 25 | Aug 17 – Sep 28 | 80–110 |
| Lettuce | Apr 20 | May 11 | May 25 | Jun 29 – Sep 7 | 30–60 |
| Lima Beans | — | Jun 1 | — | Aug 3 – Sep 14 | 60–90 |
| Loofah | Mar 30 | Jun 1 | Jun 8 | Sep 21 – Nov 23 | 100–150 |
| Luffa | Mar 30 | Jun 1 | Jun 8 | Sep 7 – Nov 23 | 90–150 |
| Mache | Apr 20 | May 11 | May 25 | Jul 6 – Aug 10 | 40–60 |
| Melon | Apr 20 | Jun 1 | Jun 8 | Aug 17 – Oct 5 | 70–100 |
| Microgreens | Apr 20 | May 11 | May 25 | Jun 1 – Jun 29 | 7–21 |
| Mitsuba | Apr 20 | May 11 | May 18 | Jul 13 – Sep 7 | 50–70 |
| Mizuna | Apr 20 | May 11 | May 25 | Jun 29 – Jul 27 | 30–45 |
| Mustard Greens | Apr 20 | May 11 | May 25 | Jun 29 – Aug 31 | 30–50 |
| Napa Cabbage | Apr 20 | May 11 | May 25 | Jul 20 – Aug 24 | 55–75 |
| New Zealand Spinach | Mar 30 | Jun 1 | Jun 8 | Aug 3 – Aug 31 | 55–70 |
| Okra | Mar 30 | Jun 1 | Jun 8 | Aug 3 – Sep 28 | 50–65 |
| Onion | Apr 20 | May 11 | May 25 | Aug 24 – Oct 12 | 90–120 |
| Pac Choi | Apr 20 | May 11 | May 25 | Jul 6 – Aug 3 | 40–55 |
| Parsnip | — | May 11 | — | Aug 24 – Oct 5 | 100–130 |
| Patty Pan Squash | Apr 20 | Jun 1 | Jun 8 | Jul 27 – Aug 24 | 45–60 |
| Peas | Apr 20 | May 11 | May 25 | Jul 20 – Sep 14 | 55–70 |
| Peppers | Mar 16 | Jun 1 | Jun 8 | Aug 10 – Oct 19 | 60–90 |
| Pole Beans | Mar 30 | Jun 1 | Jun 8 | Aug 3 – Sep 28 | 55–70 |
| Potatoes | Mar 30 | Jun 1 | Jun 8 | Aug 17 – Oct 26 | 70–120 |
| Pumpkin | Apr 20 | Jun 1 | Jun 8 | Sep 7 – Oct 26 | 85–120 |
| Purslane | Apr 20 | May 11 | May 25 | Jul 6 – Aug 10 | 40–60 |
| Radicchio | Apr 20 | May 11 | May 25 | Jul 27 – Aug 31 | 60–80 |
| Radish | — | May 11 | — | Jun 8 – Jun 29 | 22–35 |
| Rhubarb | — | — | Jun 15 | — | 365–730 |
| Romanesco | Apr 20 | May 11 | May 25 | Aug 10 – Sep 21 | 75–100 |
| Rutabaga | — | May 11 | — | Aug 3 – Sep 7 | 80–100 |
| Salsify | — | May 11 | — | Aug 24 – Oct 5 | 100–130 |
| Savoy Cabbage | Apr 20 | May 11 | May 25 | Aug 3 – Sep 28 | 70–110 |
| Scallions | Apr 20 | May 11 | May 25 | Jul 20 – Aug 17 | 50–70 |
| Scarlet Runner Beans | Mar 30 | Jun 1 | Jun 8 | Aug 10 – Sep 14 | 60–80 |
| Shallot | Apr 20 | May 11 | May 25 | Aug 24 – Oct 12 | 90–120 |
| Shiso | Apr 6 | Jun 1 | Jun 8 | Aug 3 – Sep 28 | 50–70 |
| Snap Peas | Mar 30 | Jun 1 | Jun 8 | Aug 3 – Sep 28 | 55–70 |
| Snow Peas | Apr 20 | May 11 | May 25 | Jul 20 – Sep 14 | 50–65 |
| Soybeans | — | Jun 1 | — | Aug 24 – Oct 19 | 80–120 |
| Spaghetti Squash | Apr 20 | Jun 1 | Jun 8 | Sep 7 – Oct 5 | 85–100 |
| Spinach | Apr 20 | May 11 | May 25 | Jun 29 – Aug 31 | 35–50 |
| Squash (Summer) | Apr 20 | Jun 1 | Jun 8 | Jul 27 – Sep 28 | 45–65 |
| Squash (Winter) | Apr 20 | Jun 1 | Jun 8 | Aug 31 – Oct 26 | 80–120 |
| Sunchoke | — | — | Jun 8 | Sep 28 – Nov 23 | 110–150 |
| Sunflower | Mar 30 | Jun 1 | Jun 8 | Aug 17 – Oct 5 | 70–100 |
| Sweet Corn | — | Jun 1 | — | Aug 3 – Sep 14 | 60–90 |
| Sweet Potatoes | Mar 30 | Jun 1 | Jun 8 | Sep 7 – Oct 26 | 90–120 |
| Tatsoi | Apr 20 | May 11 | May 25 | Jun 29 – Aug 3 | 35–50 |
| Tomatillo | Mar 30 | Jun 1 | Jun 8 | Aug 10 – Oct 19 | 60–85 |
| Tomatoes | Mar 30 | Jun 1 | Jun 8 | Aug 10 – Oct 19 | 60–85 |
| Turnip | — | May 11 | — | Jun 22 – Jul 27 | 40–60 |
| Watercress | Apr 20 | May 11 | May 25 | Jul 6 – Aug 10 | 40–60 |
| Watermelon | Apr 20 | Jun 1 | Jun 8 | Aug 17 – Oct 5 | 70–100 |
| Wax Beans | — | Jun 1 | — | Jul 27 – Sep 21 | 50–65 |
| Winter Melon | Mar 30 | Jun 1 | Jun 8 | Sep 7 – Oct 26 | 90–120 |
| Yard Long Beans | Mar 30 | Jun 1 | Jun 8 | Aug 3 – Sep 14 | 55–80 |
| Zucchini | Apr 20 | Jun 1 | Jun 8 | Jul 27 – Sep 21 | 45–60 |
🍓 Fruits to Grow in Garfield County
27 fruits that grow well in Zone 6a with planting dates for Garfield County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 15 | Sep 14 – Dec 28 | 90–180 |
| Aronia | — | — | Jun 15 | — | 730–1095 |
| Blackberries | — | — | Jun 15 | — | 365–730 |
| Blueberries | — | — | Jun 15 | — | 730–1095 |
| Boysenberries | — | — | Jun 15 | — | 365–730 |
| Cantaloupe | — | — | Jun 15 | Aug 24 – Sep 28 | 70–90 |
| Che Fruit | — | — | Jun 15 | — | 1095–1825 |
| Cranberries | — | — | Jun 15 | — | 730–1095 |
| Currants | — | — | Jun 15 | — | 730–1095 |
| Elderberries | — | — | Jun 15 | — | 730–1095 |
| Goji Berries | — | — | Jun 15 | — | 730–1095 |
| Gooseberries | — | — | Jun 15 | — | 730–1095 |
| Grapes | — | — | Jun 15 | — | 730–1095 |
| Ground Cherry | — | — | Jun 15 | Aug 24 – Oct 19 | 65–80 |
| Hardy Kiwi | — | — | Jun 15 | — | 1095–1825 |
| Haskaps | — | — | Jun 15 | — | 730–1095 |
| Honeydew | — | — | Jun 15 | Sep 7 – Oct 19 | 80–110 |
| Jostaberry | — | — | Jun 15 | — | 730–1095 |
| Lingonberries | — | — | Jun 15 | — | 730–1095 |
| Medlar | — | — | Jun 15 | — | 1095–1825 |
| Mulberries | — | — | Jun 15 | — | 730–1825 |
| Pawpaw | — | — | Jun 15 | — | 1095–2555 |
| Persimmon | — | — | Jun 15 | — | 1095–2555 |
| Quince | — | — | Jun 15 | — | 1095–1825 |
| Raspberries | — | — | Jun 15 | — | 365–730 |
| Serviceberries | — | — | Jun 15 | — | 730–1095 |
| Strawberries | — | — | Jun 15 | Sep 14 – Dec 28 | 90–365 |
🌿 Herbs to Grow in Garfield County
38 herbs that grow well in Zone 6a with planting dates for Garfield County.
Show all 38 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Harvest | Days to Maturity |
|---|---|---|---|---|---|
| Angelica | Apr 20 | May 11 | May 18 | — | 365–730 |
| Anise | Apr 20 | May 11 | May 18 | Aug 17 – Nov 2 | 90–120 |
| Basil | Apr 6 | Jun 1 | Jun 8 | Aug 3 – Oct 5 | 50–75 |
| Bee Balm | — | — | Jun 1 | Aug 31 – Nov 16 | 90–120 |
| Borage | Apr 20 | May 11 | May 18 | Jul 13 – Aug 31 | 50–60 |
| Caraway | Apr 20 | May 11 | May 18 | — | 365–450 |
| Catnip | — | — | Jun 1 | Aug 3 – Oct 5 | 60–80 |
| Chamomile | Apr 20 | May 11 | May 18 | Jul 20 – Sep 28 | 60–90 |
| Chervil | Apr 20 | May 11 | May 18 | Jun 29 – Aug 31 | 40–60 |
| Chives | — | — | Jun 1 | Aug 3 – Oct 12 | 60–90 |
| Cilantro | Apr 20 | May 11 | May 18 | Jun 29 – Aug 31 | 40–60 |
| Comfrey | — | — | Jun 1 | Aug 3 – Oct 12 | 60–90 |
| Cumin | Apr 20 | May 11 | May 18 | Aug 31 – Nov 2 | 100–120 |
| Dill | Apr 20 | May 11 | May 18 | Jun 29 – Aug 31 | 40–60 |
| Echinacea | — | — | Jun 1 | Oct 5 – Dec 14 | 120–180 |
| Epazote | Apr 6 | Jun 1 | Jun 8 | Jul 27 – Sep 21 | 45–60 |
| Fennel (herb) | Apr 20 | May 11 | May 18 | Jul 20 – Sep 28 | 60–90 |
| Feverfew | — | — | Jun 1 | Aug 31 – Nov 16 | 90–120 |
| Garlic Chives | — | — | Jun 1 | Aug 3 – Oct 12 | 60–90 |
| Horehound | — | — | Jun 1 | Aug 17 – Oct 12 | 75–90 |
| Hyssop | — | — | Jun 1 | Aug 10 – Oct 12 | 70–90 |
| Lavender | — | — | Jun 1 | Aug 31 – Dec 14 | 90–200 |
| Lemon Balm | — | — | Jun 1 | Aug 3 – Sep 21 | 60–70 |
| Lemon Thyme | — | — | Jun 1 | Aug 10 – Oct 12 | 70–90 |
| Lovage | — | — | Jun 1 | Aug 10 – Oct 12 | 70–90 |
| Marjoram | — | — | Jun 1 | Aug 3 – Oct 12 | 60–90 |
| Mint | — | — | Jun 1 | Aug 3 – Oct 12 | 60–90 |
| Oregano | — | — | Jun 1 | Aug 3 – Oct 12 | 60–90 |
| Parsley | Apr 20 | May 11 | May 18 | Jul 20 – Sep 21 | 60–80 |
| Rue | — | — | Jun 1 | Aug 10 – Oct 12 | 70–90 |
| Sage | — | — | Jun 1 | Aug 17 – Oct 12 | 75–90 |
| Savory | — | — | Jun 1 | Jul 27 – Sep 21 | 50–70 |
| Sorrel | Apr 20 | May 11 | May 18 | Jun 29 – Aug 31 | 40–60 |
| Tarragon | — | — | Jun 1 | Aug 3 – Oct 12 | 60–90 |
| Thai Basil | Apr 6 | Jun 1 | Jun 8 | Aug 3 – Oct 5 | 50–75 |
| Thyme | — | — | Jun 1 | Aug 10 – Oct 12 | 70–90 |
| Valerian | — | — | Jun 1 | Oct 5 – Dec 14 | 120–180 |
| Yarrow | — | — | Jun 1 | Aug 31 – Nov 16 | 90–120 |
Monthly Planting Guide for Garfield County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Garfield County.
Frequently Asked Questions
What planting zone is Garfield County, CO?
Garfield County is in USDA Hardiness Zone 6a. 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 Garfield County, CO?
Based on 31 years of NOAA weather station data, the median last spring frost in Garfield County falls around May 25. In 8 out of 10 years, last frost lands between May 2 and June 14 — a 43-day window of variability. Use June 14 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Garfield County, CO?
The median first fall frost in Garfield County arrives around September 21. In cold years it can arrive as early as September 2; in mild years as late as October 8. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Garfield County?
Garfield County has a frost-free growing season of approximately 119 days. Focus on short-season varieties and start warm-season crops indoors 6–8 weeks before last frost. Climate records show the growing season is trending shorter by about 6.31 days per decade.
What is the soil like in Garfield County for gardening?
Garfield County has predominantly Loam soil with a pH range of 6.5–7.9 and Moderately Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Garfield County?
Garfield 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 Garfield County a good location for home gardening?
Garfield County scores 33/100 (Challenging) 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 Garfield County Garden Planner — Free
A 24-page printable planner built for Garfield County (Zone 6a). 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