Frost Dates for Green River, WY 82935
Last spring frost June 4 · First fall frost September 4 · 92 frost-free days · USDA Zone 5a
ZIP 82935 has about 12,000 people.
Short season: 92 frost-free days. Spring frost risk spans May 16–June 24 (39 days). Fall frost risk spans August 15–September 25 (41 days).
Frost probability for 82935
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 24 | June 4 | May 16 |
| Fall (first frost) | August 15 | September 4 | September 25 |
Dates come from NOAA 1971–2000 freeze probabilities at GREEN RVR (23.8 km away); the 50% date is the median year.
Which crops fit a 92-day season in Green River
In Green River (92 frost-free days, a short season), 29 of 56 planner crops fit outright, 13 get two plantings, 4 need an indoor start, 9 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 30 | Jun 18–Jun 25 | 50 | no-fit: Needs 80 days; Green River has 50 after Jun 18. | — |
| Pepper | Apr 23 | Jun 18–Jun 25 | 50 | no-fit: Needs 75 days; Green River has 50 after Jun 18. | — |
| Lettuce | Apr 9 | May 7–May 14 | 127 | two-plantings: Plant May 7 and again by Jul 14; both mature before Sep 11. | Jul 14 |
| Carrots | — | May 14–May 21 | 134 | fits: 70 days to maturity, 134 available after May 14. | Jul 3 |
| Cucumber | May 14 | Jun 18–Jun 25 | 64 | fits: 60 days to maturity, 64 available after Jun 18. | — |
| Beans | — | Jun 11–Jun 25 | 78 | fits: 60 days to maturity, 78 available after Jun 11. | Jun 15 |
| Peas | — | Apr 9–Jun 18 | 155 | fits: 65 days to maturity, 155 available after Apr 9. | Jun 24 |
| Zucchini | May 21 | Jun 18–Jun 25 | 64 | fits: 55 days to maturity, 64 available after Jun 18. | — |
| Onion | Mar 12 | May 7–May 21 | 127 | fits: 100 days to maturity, 127 available after May 7. | — |
| Spinach | — | Apr 9–May 28 | 169 | two-plantings: Plant Apr 9 and again by Aug 2; both mature before Sep 25. | Aug 2 |
| Kale | Mar 26 | May 7–May 21 | 141 | two-plantings: Plant May 7 and again by Jul 18; both mature before Sep 25. | Jul 18 |
| Broccoli | Apr 9 | May 7–May 21 | 127 | fits: 80 days to maturity, 127 available after May 7. | Jun 9 |
| Cabbage | Apr 9 | May 7–May 21 | 141 | fits: 70 days to maturity, 141 available after May 7. | Jul 3 |
| Radish | — | Apr 9–Jul 2 | 155 | two-plantings: Plant Apr 9 and again by Aug 3; both mature before Sep 11. | Aug 3 |
| Beets | — | Apr 9–Jul 2 | 155 | two-plantings: Plant Apr 9 and again by Jul 4; both mature before Sep 11. | Jul 4 |
| Potatoes | — | May 21–May 28 | 113 | fits: 90 days to maturity, 113 available after May 21. | — |
| Garlic | — | Sep 4 | 197 | overwinter: Plant Sep 4 to Sep 25; harvest the following summer. | Sep 25 |
| Strawberry | — | Apr 30–Jun 25 | 148 | perennial: A perennial: plant Apr 30; it fruits from the following year and keeps producing for several years. | — |
| Corn | May 7 | Jun 11–Jun 18 | 64 | head-start: Even planted out Jun 11, the outdoor season is about 11 days short; choose an early variety or grow under cover. | — |
| Pumpkin | May 21 | Jun 18–Jun 18 | 57 | no-fit: Needs 100 days; Green River has 57 after Jun 18. | — |
| Cauliflower | Apr 23 | May 28–Jun 11 | 106 | fits: 75 days to maturity, 106 available after May 28. | Jun 14 |
| Swiss Chard | Apr 9 | May 21–May 21 | 113 | fits: 55 days to maturity, 113 available after May 21. | Jul 4 |
| Arugula | — | Apr 9–Jul 2 | 169 | two-plantings: Plant Apr 9 and again by Aug 2; both mature before Sep 25. | Aug 2 |
| Brussel Sprouts | Apr 9 | May 7–May 21 | 141 | fits: 100 days to maturity, 141 available after May 7. | Jun 3 |
| Butternut Squash | May 21 | Jun 18–Jun 25 | 57 | no-fit: Needs 100 days; Green River has 57 after Jun 18. | — |
| Eggplant | Apr 16 | Jun 18–Jun 25 | 50 | head-start: Even planted out Jun 18, the outdoor season is about 20 days short; choose an early variety or grow under cover. | — |
| Okra | May 7 | Jun 11–Jun 18 | 71 | fits: 55 days to maturity, 71 available after Jun 11. | Jun 13 |
| Basil | Apr 30 | Jun 25–Jun 25 | 57 | head-start: Even planted out Jun 25, the outdoor season is about 3 days short; choose an early variety or grow under cover. | — |
| Cilantro | — | May 7–May 28 | 127 | two-plantings: Plant May 7 and again by Jul 9; both mature before Sep 11. | Jul 9 |
| Parsley | Mar 26 | Jun 11–Jun 18 | 92 | fits: 70 days to maturity, 92 available after Jun 11. | Jun 19 |
| Celery | Mar 26 | Jun 11–Jun 25 | 92 | no-fit: Needs 120 days; Green River has 92 after Jun 11. | — |
| Scallions | Mar 26 | May 7–May 21 | 141 | two-plantings: Plant May 7 and again by Jul 13; both mature before Sep 25. | Jul 13 |
| Turnip | — | May 7–May 21 | 141 | two-plantings: Plant May 7 and again by Jul 23; both mature before Sep 25. | Jul 23 |
| Kohlrabi | — | Apr 23–May 7 | 155 | two-plantings: Plant Apr 23 and again by Jul 18; both mature before Sep 25. | Jul 18 |
| Bok Choy | May 7 | May 28–Jun 4 | 106 | two-plantings: Plant May 28 and again by Jul 14; both mature before Sep 11. | Jul 14 |
| Collards | Mar 26 | May 7–May 21 | 141 | two-plantings: Plant May 7 and again by Jul 13; both mature before Sep 25. | Jul 13 |
| Cantaloupe | May 21 | Jun 18–Jun 25 | 50 | no-fit: Needs 85 days; Green River has 50 after Jun 18. | — |
| Chives | Mar 12 | Jun 11–Jun 18 | 106 | fits: 90 days to maturity, 106 available after Jun 11. | — |
| Dill | — | Apr 9–Jul 2 | 155 | two-plantings: Plant Apr 9 and again by Jul 4; both mature before Sep 11. | Jul 4 |
| Oregano | Mar 26 | Jun 11–Jun 18 | 106 | fits: 80 days to maturity, 106 available after Jun 11. | — |
| Rosemary | Mar 12 | Jun 11–Jun 18 | 92 | fits: 80 days to maturity, 92 available after Jun 11. | — |
| Sage | Apr 9 | Jun 11–Jun 18 | 106 | fits: 75 days to maturity, 106 available after Jun 11. | — |
| Thyme | Mar 26 | Jun 11–Jun 18 | 106 | fits: 90 days to maturity, 106 available after Jun 11. | — |
| Calendula | Apr 23 | May 21–Jun 4 | 113 | fits: 50 days to maturity, 113 available after May 21. | Jul 9 |
| Cosmos | May 7 | Jun 4–Jun 18 | 78 | fits: 60 days to maturity, 78 available after Jun 4. | Jun 8 |
| Lavender | Mar 12 | Jun 4–Jun 18 | 113 | fits: 90 days to maturity, 113 available after Jun 4. | — |
| Marigolds | Apr 23 | Jun 4–Jun 11 | 78 | fits: 50 days to maturity, 78 available after Jun 4. | Jun 18 |
| Melons | May 21 | Jun 18–Jun 25 | 50 | no-fit: Needs 85 days; Green River has 50 after Jun 18. | — |
| Mint | — | Jun 4–Jun 18 | 113 | fits: 90 days to maturity, 113 available after Jun 4. | — |
| Nasturtiums | May 7 | Jun 4–Jun 11 | 78 | fits: 55 days to maturity, 78 available after Jun 4. | Jun 13 |
| Pole Beans | — | Jun 11–Jun 25 | 71 | fits: 65 days to maturity, 71 available after Jun 11. | — |
| Spaghetti Squash | May 21 | Jun 18–Jun 25 | 57 | no-fit: Needs 90 days; Green River has 57 after Jun 18. | — |
| Sunflowers | — | Jun 4–Jun 18 | 78 | fits: 70 days to maturity, 78 available after Jun 4. | — |
| Tomatillos | Apr 9 | Jun 11–Jun 18 | 57 | head-start: Even planted out Jun 11, the outdoor season is about 18 days short; choose an early variety or grow under cover. | — |
| Watermelon | May 21 | Jun 11–Jun 18 | 57 | no-fit: Needs 80 days; Green River has 57 after Jun 11. | — |
| Yellow Squash | May 21 | Jun 18–Jun 25 | 64 | fits: 55 days to maturity, 64 available after Jun 18. | — |
| Zinnias | May 7 | Jun 4–Jun 18 | 78 | fits: 60 days to maturity, 78 available after Jun 4. | Jun 8 |
Month by month in Green River
| Month | What to do |
|---|---|
| January | Plan your garden layout and order seeds. Research varieties suited to your frost dates. |
| February | Start the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost). |
| March | Start indoors: Chives (Mar 12), Lavender (Mar 12), Onion (Mar 12), Rosemary (Mar 12), Celery (Mar 26), Collards (Mar 26), +5 more. |
| April | Start indoors: Broccoli (Apr 9), Brussel Sprouts (Apr 9), Cabbage (Apr 9), Lettuce (Apr 9), Sage (Apr 9), Swiss Chard (Apr 9), +8 more. Direct sow from: Arugula (Apr 9), Beets (Apr 9), Dill (Apr 9), Peas (Apr 9), Radish (Apr 9), Spinach (Apr 9), +1 more. Plant: Strawberry (Apr 30). |
| May | Start indoors: Bok Choy (May 7), Corn (May 7), Cosmos (May 7), Nasturtiums (May 7), Okra (May 7), Zinnias (May 7), +9 more. Direct sow from: Cilantro (May 7), Turnip (May 7), Carrots (May 14), Potatoes (May 21). Transplant from: Broccoli (May 7), Brussel Sprouts (May 7), Cabbage (May 7), Collards (May 7), Kale (May 7), Lettuce (May 7), +6 more. |
| June | Direct sow from: Sunflowers (Jun 4), Beans (Jun 11), Pole Beans (Jun 11). Transplant from: Cosmos (Jun 4), Lavender (Jun 4), Marigolds (Jun 4), Mint (Jun 4), Nasturtiums (Jun 4), Zinnias (Jun 4), +23 more. Last frost around June 4. Last sowing dates: Brussel Sprouts (Jun 3), Cosmos (Jun 8), Zinnias (Jun 8), Broccoli (Jun 9), Nasturtiums (Jun 13), Okra (Jun 13), +5 more. |
| July | Last sowing dates: Cabbage (Jul 3), Carrots (Jul 3), Beets (Jul 4), Dill (Jul 4), Swiss Chard (Jul 4), Calendula (Jul 9), +8 more. |
| August | Last sowing dates: Arugula (Aug 2), Spinach (Aug 2), Radish (Aug 3). |
| September | Direct sow from: Garlic (Sep 4). First frost around September 4. Last sowing dates: Garlic (Sep 25). |
| October | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
| November | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
| December | Clean up spent plants. Add compost to beds. Rest, review, and plan next year's garden. |
Frequently Asked Questions
What is the last frost date for Green River, WY (ZIP 82935)?
The median last spring frost date for Green River, WY (ZIP code 82935) is around June 4. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before May 16; one in ten it runs past June 24.
What is the first fall frost date in Green River, WY?
The median first fall frost date for Green River, WY is around September 4. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around August 15 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Green River, WY?
The frost-free growing season in Green River is about 92 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Green River (92 frost-free days, a short season), 29 of 56 planner crops fit outright, 13 get two plantings, 4 need an indoor start, 9 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Green River, WY?
Green River, WY is in USDA hardiness zone 5a (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Green River, WY?
Start tomatoes indoors Apr 30 and plant out Jun 18 in Green River. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Green River?
Two: plant May 7 and again by Jul 14; both mature before Sep 11.
When do I plant garlic in Green River?
Sep 4 to Sep 25; it overwinters and is ready the following summer.
Can I grow Celery in Green River?
Not reliably outdoors. Needs 120 days; Green River has 92 after Jun 11.
Which nearby ZIP has a longer season?
Rock Springs (ZIP 82901) has 114 frost-free days, 22 more than Green River (ZIP 82935). See Rock Springs ZIP 82901 frost dates
Nearby and related
- Frost dates for Rock Springs, WY 82901 (38.6 mi)
- Frost dates for Evanston, WY 82930 (68.1 mi)
- Frost dates for Vernal, UT 84078 (84.1 mi)
- Frost dates for Lander, WY 82520 (86 mi)
- Frost dates for Roosevelt, UT 84066 (94 mi)
- When to plant in WY
- When to plant Beans in WY
- When to plant Strawberries in WY
- When to plant Beets in WY
- When to plant Broccoli in WY
- When to plant Carrots in WY
- When to plant Kale in WY
- Look up another ZIP