Carbon County, WY — Planting Guide
Your June game plan for Carbon County, Wyoming
Each item below is timed to Carbon County, Wyoming's frost dates and soil temperatures. Skip nothing, stress about nothing.
-
Move basil, cucumber, and peppers into the garden
Pick a cloudy afternoon or evening to plant. Less transplant shock, and your seedlings will barely blink.
-
Direct-sow basil, cucumber, and green beans
Succession planting is the secret here. Put in a row now, another in 2 weeks, a third in 4.
-
Begin indoor sowing: anemones, cosmos, and dahlias
Label every cell. You will absolutely forget which is which otherwise.
-
Basket week: radish, cress, and microgreens
Morning harvests are best — cooler temperatures mean crisper produce and longer fridge life.
Get ahead of July
- Starting indoors: basil, cucumber, and kale
- First harvests: carrots, kale, and lettuce
- Fall sowing: carrots, kale, and lettuce
Carbon County is in USDA Zone 5a. The average last spring frost is May 31 and the first fall frost is September 18, giving you a growing season of approximately 110 days.
At an elevation of 8,469 ft, Carbon County receives approximately 15.2 in of rainfall annually. Summer highs average 80°F with winter lows around 6°F. The predominant soil type is Loam.
Based on 30 years of NOAA climate station data, the last frost date here varies by 24 days year to year — ranging from May 19 in warm years to June 12 in cold years. The growing season is trending longer by about 3.22 days per decade. Carbon County scores 27/100 (Challenging) on the Microclimate Index.
🌡️ Zone
5a (-20°F to -15°F min)
❄️ Last Frost
May 31
🍂 First Frost
September 18
📅 Growing Season
110 days
⛰️ Elevation
8,469 ft
🌧️ Annual Rainfall
15.2 in
Monthly Watering Calendar for Carbon 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: Most vegetables want about 1 inch of water per week. Carbon County gets 15" a year — months that hit that 1"/week need zero supplemental watering; months that fall short, the table tells you how much to add. Saves you from drowning roots and from drought-stressing plants into bolting.
View detailed monthly data
| Month | Avg Rainfall | Rainy Days | Extra Water Needed | Watering Effort |
|---|---|---|---|---|
| Jan | 1.2 in | 7 days | — | None |
| Feb | 1 in | 6 days | — | None |
| Mar | 1.5 in | 8 days | — | None |
| Apr | 1.5 in | 6 days | 2.8 in | High |
| May | 2 in | 8 days | 2.3 in | High |
| Jun | 1.1 in | 4 days | 3.2 in | Critical |
| Jul | 1.3 in | 5 days | 3 in | High |
| Aug | 1.5 in | 6 days | 2.8 in | High |
| Sep | 1.1 in | 5 days | 3.2 in | Critical |
| Oct | 1.2 in | 6 days | 3.1 in | Critical |
| Nov | 1 in | 6 days | — | None |
| Dec | 0.9 in | 6 days | — | None |
Annual total: 15.3 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.
Carbon County Soil Profile
Soil Type
Loam
Soil pH
6.7-8.3
Drainage
Well Drained
Frost Risk Probability
Based on 30 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 12 | Sep 30 | 110 days |
| Cautious | Jun 7 | Sep 20 | 105 days |
| Average year | May 31 | Sep 18 | 110 days |
| Optimistic | May 26 | Sep 9 | 106 days |
| Aggressive (risky) | May 19 | Aug 30 | 103 days |
Not very — frost dates can vary by ±24 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 longer here (about 3.2 days per decade). Spring is arriving earlier than it used to. Good news for gardeners.
Gardening Difficulty Score
Carbon County has challenging growing conditions. Season extension and careful variety selection are essential.
Local Gardening Help in Carbon 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 Carbon County's climate and soil.
County Extension Office
Carbon County University of Wyoming Extension Extension Office
Phone: 307-766-5124
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 Carbon County
Finding local nurseries & garden centers in Carbon County
Why Buy Local
Local nurseries carry plants that are proven to grow in your area. Staff can give you advice specific to Carbon 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 Carbon County WY" or "garden center Carbon 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 Carbon County WY" or check your extension office and local parks department. Facebook groups like "Carbon County Gardeners" or "Wyoming 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 in Carbon County
Monthly daylight hours and peak sun — critical for onion varieties, photoperiod-sensitive plants, and solar garden planning.
Why this matters: The longest day at Carbon County's latitude gets longer the further north you go. Strawberries, garlic, onions all care. The shortest day gets shorter — which limits winter growing for greens without artificial light.
Longest Day
15 hours
Summer solstice daylight
Shortest Day
9 hours
Winter solstice daylight
Peak Sun Hours
11.2 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 | 9.3 hr | 5.2 hr | Short day |
| February | 10.4 hr | 6.2 hr | Short day |
| March | 11.7 hr | 7.2 hr | Short day |
| April | 13.1 hr | 7.9 hr | Neutral |
| May | 14.4 hr | 9.3 hr | Long day |
| June | 15 hr | 11.2 hr | Long day |
| July | 14.7 hr | 10.1 hr | Long day |
| August | 13.7 hr | 8.9 hr | Neutral |
| September | 12.3 hr | 8.9 hr | Neutral |
| October | 10.8 hr | 7.3 hr | Short day |
| November | 9.6 hr | 5.7 hr | Short day |
| December | 9 hr | 4.8 hr | Short day |
Peak sun hours factor in typical cloud cover — use these for solar panel and shade-planning calculations.
Soil Temperature & Composting in Carbon County
Monthly soil temps tell you when to plant warm-season crops, and when your compost pile is actively working.
Why this matters: Compost piles need 130-160°F internal temp to actively break down. Below 50°F ambient, microbial activity slows dramatically. Carbon County's soil temperature curve also tells you when your compost is working and when it's napping.
Plant Warm Crops When
Soil reaches 60°F+
Soil rarely reaches 60°F — use black plastic mulch to warm soil.
Best Month to Compost
Apr
Microbial activity peaks when soil is warm.
Active Composting
0 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 | -10°F | -1°F | ❄️ Dormant | ~36 weeks |
| Feb | -8°F | -2°F | ❄️ Dormant | ~36 weeks |
| Mar | 2°F | 4°F | ❄️ Dormant | ~36 weeks |
| Apr | 15°F | 12°F | ❄️ Dormant | ~36 weeks |
| May | 30°F | 26°F | ❄️ Dormant | ~36 weeks |
| Jun | 40°F | 33°F | ❄️ Dormant | ~36 weeks |
| Jul | 47°F | 40°F | 🐢 Slow | ~24 weeks |
| Aug | 47°F | 42°F | 🐢 Slow | ~24 weeks |
| Sep | 38°F | 38°F | ❄️ Dormant | ~36 weeks |
| Oct | 25°F | 30°F | ❄️ Dormant | ~36 weeks |
| Nov | 11°F | 19°F | ❄️ Dormant | ~36 weeks |
| Dec | -3°F | 4°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 Carbon County
Computed from local climate patterns — warmer, humid conditions increase pest generations and fungal disease risk.
For new gardeners: Warm humid regions cycle through pest generations 3-5x faster than cold dry regions. Carbon 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 5 common pests in your area
| Pest | Risk Level | Peak Months |
|---|---|---|
| Aphids | Moderate | May, Jun, Jul, Aug |
| Cabbage worms | Moderate | Jun, Jul, Aug |
| Colorado potato beetle | Moderate | Jun, Jul |
| Flea beetles | Moderate | May, Jun, Jul |
| Slugs | Low | May, Jun, Jul, Aug, Sep |
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 Carbon County
Cover crops protect bare soil, fix nitrogen, suppress weeds, and improve soil structure — with planting dates calibrated for your area.
Quick context: You don't need a farm to use cover crops. A 4x8 raised bed accepts cover crops just as well as a half-acre. Carbon County's climate determines the calendar; the principle is universal.
Spring Cover Crops (2 options) — Build soil before the main growing season
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Buckwheat | Jun 5 | Jul 24 | — | Rapid growth, attracts pollinators, suppresses weeds |
| White clover | Apr 30 | Jul 24 | ✓ 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 11 | Aug 28 | — | Deep roots break compaction, attract pollinators and beneficial insects |
Fall Cover Crops (5 options) — Plant after harvest to protect soil over winter
| Crop | Plant By | Terminate | N-Fixing | Soil Benefit |
|---|---|---|---|---|
| Daikon radish | Aug 10 | May 17 | — | Deep taproot breaks compaction, excellent for clay soils |
| Hairy vetch | Jul 6 | May 10 | ✓ Yes | Excellent nitrogen fixer, good for depleted soils |
| Oats | Aug 14 | May 10 | — | Quick biomass, winterkills in cold zones — no spring tillage needed |
| Winter rye | Jun 22 | May 17 | — | Suppresses weeds, prevents erosion, breaks up compacted soil |
| Winter wheat | Jun 9 | May 10 | — | Erosion control, weed suppression, good biomass |
Wind & Microclimate in Carbon County
What this means for you: Light wind is good (strengthens stems, aids pollination); strong wind is bad (snaps stems, dries leaves, scatters seeds). Carbon County averages 11.6 mph. If you garden near coast, ridge, or open plains, you're likely above that — plan for it.
Wind dries soil, stresses plants, and affects frost patterns. Understanding your exposure helps with garden placement.
Seasonal Wind Speed
Spring: 16 mph Summer: 12 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
9.4/10
Strongly recommended — a windbreak (fence, hedge, or row of tall crops like corn or sunflowers) will significantly improve garden yields.
Frost Pocket Risk
High
Hilly terrain with 2,724 ft of elevation range — cold air pools in low spots. Avoid planting frost-sensitive crops in valleys.
Rainwater Harvesting in Carbon County
How much water you can collect, when to collect it, and what size system you need for your garden.
Quick context: Rainwater scales linearly with roof area. A 2,000 sq ft roof in Carbon County captures ~1,200 gallons per 1" of rain — given 15" annual rainfall, that's thousands of gallons a year if you have storage to hold it.
Annual Collection
7,625 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 1,000 gal tank.
Legal Status
Unrestricted
Rainwater harvesting is fully legal in your state with no restrictions.
Best Collection Months
Mar, Apr, May, Aug
Highest rainfall months — your barrels will fill up quickly during these months.
Months to Draw From Storage
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 15.3 inches of rain per year
- A 1,000 sq ft roof can collect roughly 7,625 gallons annually
- Rainwater harvesting is fully legal in your state
- 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 Carbon County
Soil Type
Loam
Soil pH 6.7–8.3 · Well Drained drainage
Native soil is well-suited to most vegetables and herbs with regular compost additions.
Watering Needs
Drought stress: 7.5/10
High drought stress. Consistent irrigation is essential — consider drip systems, heavy mulch, and drought-tolerant varieties.
Season Tips
110-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 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 Carbon County
105 vegetables that grow well in Zone 5a with planting dates for Carbon County.
Show all 105 vegetables with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Acorn Squash | Apr 26 | Jun 7 | Jun 14 | — | Sep 6 – Oct 11 | 80–100 |
| Amaranth | Apr 5 | Jun 7 | Jun 14 | — | Sep 13 – Nov 1 | 90–120 |
| Arugula | Apr 26 | May 17 | May 31 | Jul 10 | Jul 5 – Sep 6 | 30–50 |
| Asparagus | — | — | Jun 14 | — | — | 730–1095 |
| Beets | — | May 17 | — | Jul 10 | Jul 12 – Aug 9 | 50–70 |
| Belgian Endive | Apr 26 | May 17 | May 31 | Jul 10 | Sep 20 – Nov 15 | 110–150 |
| Bitter Melon | Apr 5 | Jun 7 | Jun 14 | — | Aug 16 – Sep 27 | 60–90 |
| Black Beans | — | Jun 7 | — | — | Sep 6 – Oct 25 | 90–120 |
| Bok Choy | Apr 26 | May 17 | May 31 | Jul 10 | Jul 12 – Aug 16 | 40–60 |
| Broccoli | Apr 26 | May 17 | May 31 | Jul 10 | Aug 2 – Sep 13 | 60–90 |
| Broccoli Rabe | Apr 26 | May 17 | May 31 | Jul 10 | Jul 12 – Aug 16 | 40–60 |
| Brussels Sprouts | Apr 26 | May 17 | May 31 | Jul 10 | Aug 30 – Oct 25 | 90–130 |
| Butternut Squash | Apr 26 | Jun 7 | Jun 14 | — | Sep 13 – Oct 18 | 85–110 |
| Cabbage | Apr 26 | May 17 | May 31 | Jul 10 | Aug 2 – Sep 27 | 60–100 |
| Calabash | Apr 5 | Jun 7 | Jun 14 | — | Sep 6 – Nov 1 | 80–120 |
| Carrots | — | May 17 | — | Jul 10 | Jul 19 – Aug 23 | 60–80 |
| Cauliflower | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Sep 27 | 55–100 |
| Celeriac | Apr 26 | May 17 | May 31 | Jul 10 | Sep 13 – Oct 18 | 100–120 |
| Celery | Apr 26 | May 17 | May 31 | Jul 10 | Aug 23 – Oct 18 | 80–120 |
| Celtuce | Apr 26 | May 17 | May 31 | Jul 10 | Aug 2 – Sep 13 | 60–90 |
| Chard | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Sep 13 | 50–60 |
| Chickpeas | Apr 26 | May 17 | May 31 | Jul 10 | Aug 23 – Oct 4 | 80–110 |
| Chicory | Apr 26 | May 17 | May 31 | Jul 10 | Aug 2 – Sep 13 | 60–85 |
| Chinese Cabbage | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Aug 23 | 50–70 |
| Christmas Lima Beans | Apr 5 | Jun 7 | Jun 14 | — | Sep 6 – Oct 11 | 80–100 |
| Collard Greens | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Sep 27 | 55–75 |
| Corn | — | Jun 7 | — | — | Aug 9 – Oct 4 | 60–100 |
| Cowpeas | — | Jun 7 | — | — | Aug 9 – Sep 20 | 60–90 |
| Cress | Apr 26 | May 17 | May 31 | Jul 10 | Jun 14 – Jul 5 | 14–21 |
| Crookneck Squash | Apr 26 | Jun 7 | Jun 14 | — | Aug 2 – Aug 30 | 45–60 |
| Crosne | — | May 17 | — | Jul 10 | Oct 18 – Nov 1 | 150–200 |
| Cucumber | Apr 26 | Jun 7 | Jun 14 | — | Aug 9 – Oct 4 | 50–70 |
| Daikon | — | May 17 | — | Jul 10 | Jul 12 – Aug 9 | 50–70 |
| Delicata Squash | Apr 26 | Jun 7 | Jun 14 | — | Sep 6 – Oct 11 | 80–100 |
| Edamame | — | Jun 7 | — | — | Aug 23 – Oct 4 | 75–100 |
| Eggplant | Mar 22 | Jun 7 | Jun 14 | — | Aug 23 – Oct 25 | 65–85 |
| Endive | Apr 26 | May 17 | May 31 | Jul 10 | Jul 19 – Aug 23 | 45–65 |
| Escarole | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Aug 23 | 50–70 |
| Fava Beans | Apr 26 | May 17 | May 31 | Jul 10 | Aug 16 – Sep 27 | 75–100 |
| Fennel | Apr 5 | Jun 7 | Jun 14 | — | Aug 16 – Sep 27 | 60–90 |
| Garlic | — | — | — | Aug 7 | Nov 6 – Jan 22 | 90–240 |
| Green Beans | — | Jun 7 | — | — | Aug 2 – Sep 27 | 50–65 |
| Horseradish | — | — | Jun 14 | — | Oct 18 – Nov 29 | 120–180 |
| Hot Peppers | Mar 22 | Jun 7 | Jun 14 | — | Aug 23 – Nov 29 | 70–120 |
| Hubbard Squash | Apr 26 | Jun 7 | Jun 14 | — | Sep 27 – Nov 1 | 100–120 |
| Kabocha | Apr 26 | Jun 7 | Jun 14 | — | Sep 13 – Oct 11 | 85–100 |
| Kai Lan | Apr 26 | May 17 | May 31 | Jul 10 | Jul 19 – Aug 16 | 45–60 |
| Kale | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Sep 20 | 50–70 |
| Kidney Beans | — | Jun 7 | — | — | Sep 6 – Oct 11 | 85–110 |
| Kohlrabi | Apr 26 | May 17 | May 31 | Jul 10 | Jul 19 – Aug 23 | 45–65 |
| Komatsuna | Apr 26 | May 17 | May 31 | Jul 10 | Jul 5 – Aug 9 | 35–50 |
| Leeks | Apr 26 | May 17 | May 31 | Jul 10 | Aug 30 – Nov 15 | 90–150 |
| Lentils | Apr 26 | May 17 | May 31 | Jul 10 | Aug 23 – Oct 4 | 80–110 |
| Lettuce | Apr 26 | May 17 | May 31 | Jul 10 | Jul 5 – Sep 13 | 30–60 |
| Lima Beans | — | Jun 7 | — | — | Aug 9 – Sep 20 | 60–90 |
| Mache | Apr 26 | May 17 | May 31 | Jul 10 | Jul 12 – Aug 16 | 40–60 |
| Melon | Apr 26 | Jun 7 | Jun 14 | — | Aug 23 – Oct 11 | 70–100 |
| Microgreens | Apr 26 | May 17 | May 31 | Jul 10 | Jun 7 – Jul 5 | 7–21 |
| Mitsuba | Apr 26 | May 17 | May 24 | Jul 10 | Jul 19 – Sep 13 | 50–70 |
| Mizuna | Apr 26 | May 17 | May 31 | Jul 10 | Jul 5 – Aug 2 | 30–45 |
| Mustard Greens | Apr 26 | May 17 | May 31 | Jul 10 | Jul 5 – Sep 6 | 30–50 |
| Napa Cabbage | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Aug 30 | 55–75 |
| New Zealand Spinach | Apr 5 | Jun 7 | Jun 14 | — | Aug 9 – Sep 6 | 55–70 |
| Okra | Apr 5 | Jun 7 | Jun 14 | — | Aug 9 – Oct 4 | 50–65 |
| Onion | Apr 26 | May 17 | May 31 | Jul 10 | Aug 30 – Oct 18 | 90–120 |
| Pac Choi | Apr 26 | May 17 | May 31 | Jul 10 | Jul 12 – Aug 9 | 40–55 |
| Parsnip | — | May 17 | — | Jul 10 | Aug 30 – Oct 11 | 100–130 |
| Patty Pan Squash | Apr 26 | Jun 7 | Jun 14 | — | Aug 2 – Aug 30 | 45–60 |
| Peas | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Sep 20 | 55–70 |
| Peppers | Mar 22 | Jun 7 | Jun 14 | — | Aug 16 – Oct 25 | 60–90 |
| Pole Beans | Apr 5 | Jun 7 | Jun 14 | — | Aug 9 – Oct 4 | 55–70 |
| Potatoes | Apr 5 | Jun 7 | Jun 14 | — | Aug 23 – Nov 1 | 70–120 |
| Pumpkin | Apr 26 | Jun 7 | Jun 14 | — | Sep 13 – Nov 1 | 85–120 |
| Purslane | Apr 26 | May 17 | May 31 | Jul 10 | Jul 12 – Aug 16 | 40–60 |
| Radicchio | Apr 26 | May 17 | May 31 | Jul 10 | Aug 2 – Sep 6 | 60–80 |
| Radish | — | May 17 | — | Jul 10 | Jun 14 – Jul 5 | 22–35 |
| Rhubarb | — | — | Jun 21 | — | — | 365–730 |
| Romanesco | Apr 26 | May 17 | May 31 | Jul 10 | Aug 16 – Sep 27 | 75–100 |
| Rutabaga | — | May 17 | — | Jul 10 | Aug 9 – Sep 13 | 80–100 |
| Salsify | — | May 17 | — | Jul 10 | Aug 30 – Oct 11 | 100–130 |
| Savoy Cabbage | Apr 26 | May 17 | May 31 | Jul 10 | Aug 9 – Oct 4 | 70–110 |
| Scallions | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Aug 23 | 50–70 |
| Scarlet Runner Beans | Apr 5 | Jun 7 | Jun 14 | — | Aug 16 – Sep 20 | 60–80 |
| Shallot | Apr 26 | May 17 | May 31 | Jul 10 | Aug 30 – Oct 18 | 90–120 |
| Shiso | Apr 12 | Jun 7 | Jun 14 | — | Aug 9 – Oct 4 | 50–70 |
| Snap Peas | Apr 5 | Jun 7 | Jun 14 | — | Aug 9 – Oct 4 | 55–70 |
| Snow Peas | Apr 26 | May 17 | May 31 | Jul 10 | Jul 26 – Sep 20 | 50–65 |
| Soybeans | — | Jun 7 | — | — | Aug 30 – Oct 25 | 80–120 |
| Spaghetti Squash | Apr 26 | Jun 7 | Jun 14 | — | Sep 13 – Oct 11 | 85–100 |
| Spinach | Apr 26 | May 17 | May 31 | Jul 10 | Jul 5 – Sep 6 | 35–50 |
| Squash (Summer) | Apr 26 | Jun 7 | Jun 14 | — | Aug 2 – Oct 4 | 45–65 |
| Squash (Winter) | Apr 26 | Jun 7 | Jun 14 | — | Sep 6 – Nov 1 | 80–120 |
| Sunchoke | — | — | Jun 14 | — | Oct 4 – Nov 29 | 110–150 |
| Sweet Corn | — | Jun 7 | — | — | Aug 9 – Sep 20 | 60–90 |
| Sweet Potatoes | Apr 5 | Jun 7 | Jun 14 | — | Sep 13 – Nov 1 | 90–120 |
| Tatsoi | Apr 26 | May 17 | May 31 | Jul 10 | Jul 5 – Aug 9 | 35–50 |
| Tomatillo | Apr 5 | Jun 7 | Jun 14 | — | Aug 16 – Oct 25 | 60–85 |
| Tomatoes | Apr 5 | Jun 7 | Jun 14 | — | Aug 16 – Oct 25 | 60–85 |
| Turnip | — | May 17 | — | Jul 10 | Jun 28 – Aug 2 | 40–60 |
| Watercress | Apr 26 | May 17 | May 31 | Jul 10 | Jul 12 – Aug 16 | 40–60 |
| Watermelon | Apr 26 | Jun 7 | Jun 14 | — | Aug 23 – Oct 11 | 70–100 |
| Wax Beans | — | Jun 7 | — | — | Aug 2 – Sep 27 | 50–65 |
| Winter Melon | Apr 5 | Jun 7 | Jun 14 | — | Sep 13 – Nov 1 | 90–120 |
| Yard Long Beans | Apr 5 | Jun 7 | Jun 14 | — | Aug 9 – Sep 20 | 55–80 |
| Zucchini | Apr 26 | Jun 7 | Jun 14 | — | Aug 2 – Sep 27 | 45–60 |
🍓 Fruits to Grow in Carbon County
27 fruits that grow well in Zone 5a with planting dates for Carbon County.
Show all 27 fruits with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Alpine Strawberries | — | — | Jun 21 | — | Sep 20 – Dec 6 | 90–180 |
| Aronia | — | — | Jun 21 | — | — | 730–1095 |
| Blackberries | — | — | Jun 21 | — | — | 365–730 |
| Blueberries | — | — | Jun 21 | — | — | 730–1095 |
| Boysenberries | — | — | Jun 21 | — | — | 365–730 |
| Cantaloupe | — | — | Jun 21 | — | Aug 30 – Oct 4 | 70–90 |
| Che Fruit | — | — | Jun 21 | — | — | 1095–1825 |
| Cranberries | — | — | Jun 21 | — | — | 730–1095 |
| Currants | — | — | Jun 21 | — | — | 730–1095 |
| Elderberries | — | — | Jun 21 | — | — | 730–1095 |
| Goji Berries | — | — | Jun 21 | — | — | 730–1095 |
| Gooseberries | — | — | Jun 21 | — | — | 730–1095 |
| Grapes | — | — | Jun 21 | — | — | 730–1095 |
| Ground Cherry | — | — | Jun 21 | — | Aug 30 – Oct 25 | 65–80 |
| Hardy Kiwi | — | — | Jun 21 | — | — | 1095–1825 |
| Haskaps | — | — | Jun 21 | — | — | 730–1095 |
| Honeydew | — | — | Jun 21 | — | Sep 13 – Oct 25 | 80–110 |
| Jostaberry | — | — | Jun 21 | — | — | 730–1095 |
| Lingonberries | — | — | Jun 21 | — | — | 730–1095 |
| Medlar | — | — | Jun 21 | — | — | 1095–1825 |
| Mulberries | — | — | Jun 21 | — | — | 730–1825 |
| Pawpaw | — | — | Jun 21 | — | — | 1095–2555 |
| Persimmon | — | — | Jun 21 | — | — | 1095–2555 |
| Quince | — | — | Jun 21 | — | — | 1095–1825 |
| Raspberries | — | — | Jun 21 | — | — | 365–730 |
| Serviceberries | — | — | Jun 21 | — | — | 730–1095 |
| Strawberries | — | — | Jun 21 | — | Sep 20 – Dec 6 | 90–365 |
🌿 Herbs to Grow in Carbon County
34 herbs that grow well in Zone 5a with planting dates for Carbon County.
Show all 34 herbs with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Harvest | Days to Maturity |
|---|---|---|---|---|---|---|
| Angelica | Apr 26 | May 17 | May 24 | Jul 10 | — | 365–730 |
| Anise | Apr 26 | May 17 | May 24 | Jul 10 | Aug 23 – Nov 8 | 90–120 |
| Basil | Apr 12 | Jun 7 | Jun 14 | — | Aug 9 – Oct 11 | 50–75 |
| Bee Balm | — | — | Jun 7 | — | Sep 6 – Nov 22 | 90–120 |
| Borage | Apr 26 | May 17 | May 24 | Jul 10 | Jul 19 – Sep 6 | 50–60 |
| Caraway | Apr 26 | May 17 | May 24 | Jul 10 | — | 365–450 |
| Catnip | — | — | Jun 7 | — | Aug 9 – Oct 11 | 60–80 |
| Chamomile | Apr 26 | May 17 | May 24 | Jul 10 | Jul 26 – Oct 4 | 60–90 |
| Chervil | Apr 26 | May 17 | May 24 | Jul 10 | Jul 5 – Sep 6 | 40–60 |
| Chives | — | — | Jun 7 | — | Aug 9 – Oct 18 | 60–90 |
| Cilantro | Apr 26 | May 17 | May 24 | Jul 10 | Jul 5 – Sep 6 | 40–60 |
| Comfrey | — | — | Jun 7 | — | Aug 9 – Oct 18 | 60–90 |
| Cumin | Apr 26 | May 17 | May 24 | Jul 10 | Sep 6 – Nov 8 | 100–120 |
| Dill | Apr 26 | May 17 | May 24 | Jul 10 | Jul 5 – Sep 6 | 40–60 |
| Epazote | Apr 12 | Jun 7 | Jun 14 | — | Aug 2 – Sep 27 | 45–60 |
| Fennel (herb) | Apr 26 | May 17 | May 24 | Jul 10 | Jul 26 – Oct 4 | 60–90 |
| Feverfew | — | — | Jun 7 | — | Sep 6 – Nov 22 | 90–120 |
| Garlic Chives | — | — | Jun 7 | — | Aug 9 – Oct 18 | 60–90 |
| Horehound | — | — | Jun 7 | — | Aug 23 – Oct 18 | 75–90 |
| Hyssop | — | — | Jun 7 | — | Aug 16 – Oct 18 | 70–90 |
| Lemon Balm | — | — | Jun 7 | — | Aug 9 – Sep 27 | 60–70 |
| Lemon Thyme | — | — | Jun 7 | — | Aug 16 – Oct 18 | 70–90 |
| Lovage | — | — | Jun 7 | — | Aug 16 – Oct 18 | 70–90 |
| Mint | — | — | Jun 7 | — | Aug 9 – Oct 18 | 60–90 |
| Oregano | — | — | Jun 7 | — | Aug 9 – Oct 18 | 60–90 |
| Parsley | Apr 26 | May 17 | May 24 | Jul 10 | Jul 26 – Sep 27 | 60–80 |
| Rue | — | — | Jun 7 | — | Aug 16 – Oct 18 | 70–90 |
| Sage | — | — | Jun 7 | — | Aug 23 – Oct 18 | 75–90 |
| Savory | — | — | Jun 7 | — | Aug 2 – Sep 27 | 50–70 |
| Sorrel | Apr 26 | May 17 | May 24 | Jul 10 | Jul 5 – Sep 6 | 40–60 |
| Tarragon | — | — | Jun 7 | — | Aug 9 – Oct 18 | 60–90 |
| Thai Basil | Apr 12 | Jun 7 | Jun 14 | — | Aug 9 – Oct 11 | 50–75 |
| Thyme | — | — | Jun 7 | — | Aug 16 – Oct 18 | 70–90 |
| Valerian | — | — | Jun 7 | — | Oct 11 – Nov 22 | 120–180 |
🌸 Flowers to Grow in Carbon County
51 flowers that grow well in Zone 5a with planting dates for Carbon County.
Show all 51 flowers with planting dates
| Plant | Start Indoors | Direct Sow | Transplant | Fall Plant | Bloom | Days to Maturity |
|---|---|---|---|---|---|---|
| Ageratum | Apr 12 | Jun 7 | Jun 7 | — | Aug 2 – Oct 25 | 60–75 |
| Alliums | — | — | — | Aug 7 | Sep 11 – Oct 9 | 28–42 |
| Anemones | May 3 | — | May 31 | — | Jul 12 – Aug 9 | 90–120 |
| Astilbe | Mar 29 | — | Jun 14 | — | Aug 30 – Nov 1 | 70–100 |
| Bachelor's Button | Apr 19 | May 10 | May 31 | — | Aug 2 – Oct 11 | 60–90 |
| Begonias | Mar 22 | — | Jun 7 | — | Aug 16 – Nov 8 | 70–90 |
| Black-eyed Susan | Mar 29 | May 31 | Jun 14 | — | Aug 30 – Nov 29 | 60–80 |
| Bleeding Hearts | Mar 29 | — | Jun 14 | — | Aug 9 – Sep 20 | 60–90 |
| Calendula | Apr 19 | May 10 | May 31 | — | Jul 19 – Oct 11 | 50–70 |
| Celosia | Apr 26 | Jun 14 | Jun 14 | — | Aug 16 – Nov 15 | 60–90 |
| Columbine | Mar 29 | Jun 14 | Jun 14 | — | Aug 9 – Sep 20 | 70–100 |
| Coreopsis | Mar 29 | Jun 7 | Jun 14 | — | Aug 23 – Nov 29 | 60–80 |
| Cosmos | May 3 | Jun 7 | Jun 7 | — | Aug 16 – Nov 8 | 60–90 |
| Crocus | — | — | — | Aug 7 | Jun 19 – Jul 10 | 10–20 |
| Daffodils | — | — | — | Aug 7 | Jun 26 – Jul 17 | 20–40 |
| Dahlias | May 3 | Jun 7 | Jun 7 | — | Aug 30 – Nov 22 | 70–120 |
| Daylily | Mar 29 | — | Jun 14 | — | Sep 6 – Nov 29 | 60–90 |
| Dianthus | Mar 29 | May 3 | May 17 | — | Jul 5 – Sep 20 | 60–80 |
| Echinacea (Purple Coneflower) | Mar 29 | Jun 14 | Jun 14 | — | Sep 6 – Nov 29 | 70–90 |
| Foxglove | Mar 29 | Jun 14 | Jun 14 | — | Aug 9 – Sep 20 | 80–120 |
| Gaillardia (Blanket Flower) | Apr 5 | Jun 14 | Jun 14 | — | Aug 23 – Dec 13 | 70–100 |
| Geraniums | Mar 22 | — | Jun 7 | — | Aug 16 – Nov 8 | 70–100 |
| Gladiolus | — | Jun 7 | Jun 7 | — | Aug 30 – Nov 22 | 70–100 |
| Hostas | Mar 22 | — | Jun 14 | — | Sep 6 – Nov 29 | 60–90 |
| Hyacinths | — | — | — | Aug 7 | Jul 17 – Aug 14 | 14–28 |
| Hydrangeas | Mar 22 | — | Jun 14 | — | Aug 30 – Nov 15 | 90–150 |
| Impatiens | Apr 5 | — | Jun 7 | — | Aug 16 – Nov 8 | 60–75 |
| Irises | — | Division | Jun 14 | — | Aug 9 – Sep 13 | 60–100 |
| Larkspur | — | May 3 | — | — | Jul 12 – Sep 6 | 60–90 |
| Lavender | Mar 22 | — | Jun 21 | — | Aug 30 – Oct 11 | 90–120 |
| Lilies | — | Division | Jun 14 | — | Aug 23 – Nov 15 | 70–120 |
| Lobelia | Mar 22 | — | May 24 | — | Jul 19 – Sep 27 | 70–80 |
| Lupine | Mar 29 | Jun 14 | Jun 14 | — | Aug 9 – Sep 20 | 75–100 |
| Marigolds | Apr 19 | Jun 7 | Jun 7 | — | Aug 2 – Oct 25 | 50–70 |
| Nasturtium | May 3 | Jun 7 | Jun 7 | — | Aug 2 – Nov 8 | 55–65 |
| Pansy | Mar 22 | — | May 31 | — | Jul 26 – Sep 20 | 70–90 |
| Peonies | — | Division | Jun 14 | — | Aug 23 – Oct 4 | 90–120 |
| Petunia | Apr 5 | — | Jun 7 | — | Aug 16 – Nov 8 | 70–90 |
| Phlox | Mar 29 | Jun 14 | Jun 14 | — | Aug 30 – Nov 15 | 80–110 |
| Portulaca | Apr 26 | Jun 14 | Jun 14 | — | Aug 2 – Nov 1 | 50–70 |
| Roses | Mar 22 | — | Jun 14 | — | Aug 30 – Nov 29 | 90–180 |
| Salvia | Mar 29 | — | Jun 7 | — | Aug 16 – Nov 8 | 70–90 |
| Sedum (Stonecrop) | Mar 29 | — | Jun 14 | — | Oct 11 – Dec 13 | 60–90 |
| Snapdragon | Mar 22 | May 17 | May 31 | — | Aug 9 – Oct 11 | 70–100 |
| Sunflower | May 10 | Jun 7 | Jun 7 | — | Aug 30 – Nov 8 | 70–100 |
| Sweet Alyssum | Apr 12 | May 17 | May 31 | — | Jul 12 – Sep 20 | 45–60 |
| Sweet Pea | Apr 19 | Apr 26 | May 31 | — | Aug 16 – Oct 18 | 65–85 |
| Tulips | — | — | — | Aug 7 | Jul 10 – Jul 31 | 15–30 |
| Vinca (Annual) | Mar 15 | — | Jun 14 | — | Aug 23 – Nov 8 | 70–90 |
| Yarrow | Mar 29 | May 31 | Jun 14 | — | Aug 23 – Nov 29 | 60–90 |
| Zinnia | May 3 | Jun 7 | Jun 7 | — | Aug 16 – Nov 8 | 60–70 |
Monthly Planting Guide for Carbon County
Gardening Guides & Resources
Helpful guides from The Ultimate Homestead to improve your garden in Carbon County.
Frequently Asked Questions
What planting zone is Carbon County, WY?
Carbon County is in USDA Hardiness Zone 5a. 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 Carbon County, WY?
Based on 30 years of NOAA weather station data, the median last spring frost in Carbon County falls around May 31. In 8 out of 10 years, last frost lands between May 19 and June 12 — a 24-day window of variability. Use June 12 as your conservative safe-to-plant date for frost-sensitive crops.
When is the first fall frost in Carbon County, WY?
The median first fall frost in Carbon County arrives around September 18. In cold years it can arrive as early as August 30; in mild years as late as September 30. Harvest or protect frost-sensitive crops — tomatoes, peppers, basil, squash — before this date.
How long is the growing season in Carbon County?
Carbon County has a frost-free growing season of approximately 110 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 longer by about 3.22 days per decade.
What is the soil like in Carbon County for gardening?
Carbon County has predominantly Loam soil with a pH range of 6.7–8.3 and Well Drained drainage. Most vegetables and herbs grow well with standard composting and seasonal soil amendment.
What is grown commercially in Carbon County?
Carbon County has commercial agriculture that includes Cattle, Wheat, Hay, Barley. These crops reflect the local climate and soil conditions — what succeeds commercially often translates well to home gardens in the same area.
Is Carbon County a good location for home gardening?
Carbon County scores 27/100 (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 Carbon County Garden Planner — Free
A 22-page printable planner built for Carbon County (Zone 5a). 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