Frost Dates for Evanston, WY 82930
Last spring frost June 16 · First fall frost September 9 · 85 frost-free days · USDA Zone 5a
ZIP 82930 has about 14,400 people.
Short season: 85 frost-free days. Spring frost risk spans May 25–June 30 (36 days). Fall frost risk spans August 25–September 25 (31 days).
Frost probability for 82930
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 30 | June 16 | May 25 |
| Fall (first frost) | August 25 | September 9 | September 25 |
Dates come from NOAA 1971–2000 freeze probabilities at MTN VIEW (38.5 km away); the 50% date is the median year.
Which crops fit a 85-day season in Evanston
In Evanston (85 frost-free days, a short season), 28 of 56 planner crops fit outright, 12 get two plantings, 3 need an indoor start, 1 need a faster variety, 11 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | May 12 | Jun 30–Jul 7 | 43 | no-fit: Needs 80 days; Evanston has 43 after Jun 30. | — |
| Pepper | May 5 | Jun 30–Jul 7 | 43 | no-fit: Needs 75 days; Evanston has 43 after Jun 30. | — |
| Lettuce | Apr 21 | May 19–May 26 | 120 | two-plantings: Plant May 19 and again by Jul 19; both mature before Sep 16. | Jul 19 |
| Carrots | — | May 26–Jun 2 | 127 | fits: 70 days to maturity, 127 available after May 26. | Jul 8 |
| Cucumber | May 26 | Jun 30–Jul 7 | 57 | head-start: Even planted out Jun 30, the outdoor season is about 3 days short; choose an early variety or grow under cover. | — |
| Beans | — | Jun 23–Jul 7 | 71 | fits: 60 days to maturity, 71 available after Jun 23. | — |
| Peas | — | Apr 21–Jun 30 | 148 | fits: 65 days to maturity, 148 available after Apr 21. | Jun 29 |
| Zucchini | Jun 2 | Jun 30–Jul 7 | 57 | fits: 55 days to maturity, 57 available after Jun 30. | — |
| Onion | Mar 24 | May 19–Jun 2 | 120 | fits: 100 days to maturity, 120 available after May 19. | — |
| Spinach | — | Apr 21–Jun 9 | 162 | two-plantings: Plant Apr 21 and again by Aug 7; both mature before Sep 30. | Aug 7 |
| Kale | Apr 7 | May 19–Jun 2 | 134 | two-plantings: Plant May 19 and again by Jul 23; both mature before Sep 30. | Jul 23 |
| Broccoli | Apr 21 | May 19–Jun 2 | 120 | fits: 80 days to maturity, 120 available after May 19. | Jun 14 |
| Cabbage | Apr 21 | May 19–Jun 2 | 134 | fits: 70 days to maturity, 134 available after May 19. | Jul 8 |
| Radish | — | Apr 21–Jul 14 | 148 | two-plantings: Plant Apr 21 and again by Aug 8; both mature before Sep 16. | Aug 8 |
| Beets | — | Apr 21–Jul 14 | 148 | two-plantings: Plant Apr 21 and again by Jul 9; both mature before Sep 16. | Jul 9 |
| Potatoes | — | Jun 2–Jun 9 | 106 | fits: 90 days to maturity, 106 available after Jun 2. | — |
| Garlic | — | Sep 9 | 190 | overwinter: Plant Sep 9 to Sep 30; harvest the following summer. | Sep 30 |
| Strawberry | — | May 12–Jul 7 | 141 | perennial: A perennial: plant May 12; it fruits from the following year and keeps producing for several years. | — |
| Corn | May 19 | Jun 23–Jun 30 | 57 | head-start: Even planted out Jun 23, the outdoor season is about 18 days short; choose an early variety or grow under cover. | — |
| Pumpkin | Jun 2 | Jun 30–Jun 30 | 50 | no-fit: Needs 100 days; Evanston has 50 after Jun 30. | — |
| Cauliflower | May 5 | Jun 9–Jun 23 | 99 | fits: 75 days to maturity, 99 available after Jun 9. | Jun 19 |
| Swiss Chard | Apr 21 | Jun 2–Jun 2 | 106 | fits: 55 days to maturity, 106 available after Jun 2. | Jul 9 |
| Arugula | — | Apr 21–Jul 14 | 162 | two-plantings: Plant Apr 21 and again by Aug 7; both mature before Sep 30. | Aug 7 |
| Brussel Sprouts | Apr 21 | May 19–Jun 2 | 134 | fits: 100 days to maturity, 134 available after May 19. | Jun 8 |
| Butternut Squash | Jun 2 | Jun 30–Jul 7 | 50 | no-fit: Needs 100 days; Evanston has 50 after Jun 30. | — |
| Eggplant | Apr 28 | Jun 30–Jul 7 | 43 | no-fit: Needs 70 days; Evanston has 43 after Jun 30. | — |
| Okra | May 19 | Jun 23–Jun 30 | 64 | fits: 55 days to maturity, 64 available after Jun 23. | — |
| Basil | May 12 | Jul 7–Jul 7 | 50 | head-start: Even planted out Jul 7, the outdoor season is about 10 days short; choose an early variety or grow under cover. | — |
| Cilantro | — | May 19–Jun 9 | 120 | two-plantings: Plant May 19 and again by Jul 14; both mature before Sep 16. | Jul 14 |
| Parsley | Apr 7 | Jun 23–Jun 30 | 85 | fits: 70 days to maturity, 85 available after Jun 23. | Jun 24 |
| Celery | Apr 7 | Jun 23–Jul 7 | 85 | no-fit: Needs 120 days; Evanston has 85 after Jun 23. | — |
| Scallions | Apr 7 | May 19–Jun 2 | 134 | two-plantings: Plant May 19 and again by Jul 18; both mature before Sep 30. | Jul 18 |
| Turnip | — | May 19–Jun 2 | 134 | two-plantings: Plant May 19 and again by Jul 28; both mature before Sep 30. | Jul 28 |
| Kohlrabi | — | May 5–May 19 | 148 | two-plantings: Plant May 5 and again by Jul 23; both mature before Sep 30. | Jul 23 |
| Bok Choy | May 19 | Jun 9–Jun 16 | 99 | fits: 45 days to maturity, 99 available after Jun 9. | Jul 19 |
| Collards | Apr 7 | May 19–Jun 2 | 134 | two-plantings: Plant May 19 and again by Jul 18; both mature before Sep 30. | Jul 18 |
| Cantaloupe | Jun 2 | Jun 30–Jul 7 | 43 | no-fit: Needs 85 days; Evanston has 43 after Jun 30. | — |
| Chives | Mar 24 | Jun 23–Jun 30 | 99 | fits: 90 days to maturity, 99 available after Jun 23. | — |
| Dill | — | Apr 21–Jul 14 | 148 | two-plantings: Plant Apr 21 and again by Jul 9; both mature before Sep 16. | Jul 9 |
| Oregano | Apr 7 | Jun 23–Jun 30 | 99 | fits: 80 days to maturity, 99 available after Jun 23. | — |
| Rosemary | Mar 24 | Jun 23–Jun 30 | 85 | fits: 80 days to maturity, 85 available after Jun 23. | — |
| Sage | Apr 21 | Jun 23–Jun 30 | 99 | fits: 75 days to maturity, 99 available after Jun 23. | — |
| Thyme | Apr 7 | Jun 23–Jun 30 | 99 | fits: 90 days to maturity, 99 available after Jun 23. | — |
| Calendula | May 5 | Jun 2–Jun 16 | 106 | fits: 50 days to maturity, 106 available after Jun 2. | Jul 14 |
| Cosmos | May 19 | Jun 16–Jun 30 | 71 | fits: 60 days to maturity, 71 available after Jun 16. | — |
| Lavender | Mar 24 | Jun 16–Jun 30 | 106 | fits: 90 days to maturity, 106 available after Jun 16. | — |
| Marigolds | May 5 | Jun 16–Jun 23 | 71 | fits: 50 days to maturity, 71 available after Jun 16. | Jun 23 |
| Melons | Jun 2 | Jun 30–Jul 7 | 43 | no-fit: Needs 85 days; Evanston has 43 after Jun 30. | — |
| Mint | — | Jun 16–Jun 30 | 106 | fits: 90 days to maturity, 106 available after Jun 16. | — |
| Nasturtiums | May 19 | Jun 16–Jun 23 | 71 | fits: 55 days to maturity, 71 available after Jun 16. | Jun 18 |
| Pole Beans | — | Jun 23–Jul 7 | 64 | tight: Direct-sow only; pick a variety under 64 days. | — |
| Spaghetti Squash | Jun 2 | Jun 30–Jul 7 | 50 | no-fit: Needs 90 days; Evanston has 50 after Jun 30. | — |
| Sunflowers | — | Jun 16–Jun 30 | 71 | fits: 70 days to maturity, 71 available after Jun 16. | — |
| Tomatillos | Apr 21 | Jun 23–Jun 30 | 50 | no-fit: Needs 75 days; Evanston has 50 after Jun 23. | — |
| Watermelon | Jun 2 | Jun 23–Jun 30 | 50 | no-fit: Needs 80 days; Evanston has 50 after Jun 23. | — |
| Yellow Squash | Jun 2 | Jun 30–Jul 7 | 57 | fits: 55 days to maturity, 57 available after Jun 30. | — |
| Zinnias | May 19 | Jun 16–Jun 30 | 71 | fits: 60 days to maturity, 71 available after Jun 16. | — |
Month by month in Evanston
| 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 24), Lavender (Mar 24), Onion (Mar 24), Rosemary (Mar 24). |
| April | Start indoors: Celery (Apr 7), Collards (Apr 7), Kale (Apr 7), Oregano (Apr 7), Parsley (Apr 7), Scallions (Apr 7), +9 more. Direct sow from: Arugula (Apr 21), Beets (Apr 21), Dill (Apr 21), Peas (Apr 21), Radish (Apr 21), Spinach (Apr 21). |
| May | Start indoors: Calendula (May 5), Cauliflower (May 5), Marigolds (May 5), Pepper (May 5), Basil (May 12), Tomato (May 12), +7 more. Direct sow from: Kohlrabi (May 5), Cilantro (May 19), Turnip (May 19), Carrots (May 26). Transplant from: Broccoli (May 19), Brussel Sprouts (May 19), Cabbage (May 19), Collards (May 19), Kale (May 19), Lettuce (May 19), +2 more. Plant: Strawberry (May 12). |
| June | Start indoors: Butternut Squash (Jun 2), Cantaloupe (Jun 2), Melons (Jun 2), Pumpkin (Jun 2), Spaghetti Squash (Jun 2), Watermelon (Jun 2), +2 more. Direct sow from: Potatoes (Jun 2), Sunflowers (Jun 16), Beans (Jun 23), Pole Beans (Jun 23). Transplant from: Calendula (Jun 2), Swiss Chard (Jun 2), Bok Choy (Jun 9), Cauliflower (Jun 9), Cosmos (Jun 16), Lavender (Jun 16), +26 more. Last frost around June 16. Last sowing dates: Brussel Sprouts (Jun 8), Broccoli (Jun 14), Nasturtiums (Jun 18), Cauliflower (Jun 19), Marigolds (Jun 23), Parsley (Jun 24), +1 more. |
| July | Transplant from: Basil (Jul 7). Last sowing dates: Cabbage (Jul 8), Carrots (Jul 8), Beets (Jul 9), Dill (Jul 9), Swiss Chard (Jul 9), Calendula (Jul 14), +8 more. |
| August | Last sowing dates: Arugula (Aug 7), Spinach (Aug 7), Radish (Aug 8). |
| September | Direct sow from: Garlic (Sep 9). First frost around September 9. Last sowing dates: Garlic (Sep 30). |
| 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 Evanston, WY (ZIP 82930)?
The median last spring frost date for Evanston, WY (ZIP code 82930) is around June 16. 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 25; one in ten it runs past June 30.
What is the first fall frost date in Evanston, WY?
The median first fall frost date for Evanston, WY is around September 9. 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 25 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Evanston, WY?
The frost-free growing season in Evanston is about 85 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 Evanston (85 frost-free days, a short season), 28 of 56 planner crops fit outright, 12 get two plantings, 3 need an indoor start, 1 need a faster variety, 11 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Evanston, WY?
Evanston, 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 Evanston, WY?
Start tomatoes indoors May 12 and plant out Jun 30 in Evanston. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Evanston?
Two: plant May 19 and again by Jul 19; both mature before Sep 16.
When do I plant garlic in Evanston?
Sep 9 to Sep 30; it overwinters and is ready the following summer.
Can I grow Celery in Evanston?
Not reliably outdoors. Needs 120 days; Evanston has 85 after Jun 23.
Which nearby ZIP has a longer season?
Roosevelt (ZIP 84066) has 130 frost-free days, 45 more than Evanston (ZIP 82930). See Roosevelt ZIP 84066 frost dates
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