Frost Dates for Lander, WY 82520
Last spring frost May 26 · First fall frost September 15 · 112 frost-free days · USDA Zone 5a
ZIP 82520 has about 13,300 people.
Short season: 112 frost-free days. Spring frost risk spans May 3–June 18 (46 days). Fall frost risk spans September 3–September 28 (25 days).
Frost probability for 82520
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | June 18 | May 26 | May 3 |
| Fall (first frost) | September 3 | September 15 | September 28 |
Dates come from NOAA 1971–2000 freeze probabilities at RIVERTON (46.4 km away); the 50% date is the median year.
Which crops fit a 112-day season in Lander
In Lander (112 frost-free days, a short season), 31 of 56 planner crops fit outright, 15 get two plantings, 7 need an indoor start, 2 don't reliably mature, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Apr 21 | Jun 9–Jun 16 | 70 | head-start: Even planted out Jun 9, the outdoor season is about 10 days short; choose an early variety or grow under cover. | — |
| Pepper | Apr 14 | Jun 9–Jun 16 | 70 | head-start: Even planted out Jun 9, the outdoor season is about 5 days short; choose an early variety or grow under cover. | — |
| Lettuce | Mar 31 | Apr 28–May 5 | 147 | two-plantings: Plant Apr 28 and again by Jul 25; both mature before Sep 22. | Jul 25 |
| Carrots | — | May 5–May 12 | 154 | fits: 70 days to maturity, 154 available after May 5. | Jul 14 |
| Cucumber | May 5 | Jun 9–Jun 16 | 84 | fits: 60 days to maturity, 84 available after Jun 9. | Jun 19 |
| Beans | — | Jun 2–Jun 16 | 98 | fits: 60 days to maturity, 98 available after Jun 2. | Jun 26 |
| Peas | — | Mar 31–Jun 9 | 175 | fits: 65 days to maturity, 175 available after Mar 31. | Jul 5 |
| Zucchini | May 12 | Jun 9–Jun 16 | 84 | fits: 55 days to maturity, 84 available after Jun 9. | Jun 24 |
| Onion | Mar 3 | Apr 28–May 12 | 147 | fits: 100 days to maturity, 147 available after Apr 28. | — |
| Spinach | — | Mar 31–May 19 | 189 | two-plantings: Plant Mar 31 and again by Aug 13; both mature before Oct 6. | Aug 13 |
| Kale | Mar 17 | Apr 28–May 12 | 161 | two-plantings: Plant Apr 28 and again by Jul 29; both mature before Oct 6. | Jul 29 |
| Broccoli | Mar 31 | Apr 28–May 12 | 147 | fits: 80 days to maturity, 147 available after Apr 28. | Jun 20 |
| Cabbage | Mar 31 | Apr 28–May 12 | 161 | fits: 70 days to maturity, 161 available after Apr 28. | Jul 14 |
| Radish | — | Mar 31–Jun 23 | 175 | two-plantings: Plant Mar 31 and again by Aug 14; both mature before Sep 22. | Aug 14 |
| Beets | — | Mar 31–Jun 23 | 175 | two-plantings: Plant Mar 31 and again by Jul 15; both mature before Sep 22. | Jul 15 |
| Potatoes | — | May 12–May 19 | 133 | fits: 90 days to maturity, 133 available after May 12. | — |
| Garlic | — | Sep 15 | 217 | overwinter: Plant Sep 15 to Oct 6; harvest the following summer. | Oct 6 |
| Strawberry | — | Apr 21–Jun 16 | 168 | perennial: A perennial: plant Apr 21; it fruits from the following year and keeps producing for several years. | — |
| Corn | Apr 28 | Jun 2–Jun 9 | 84 | fits: 75 days to maturity, 84 available after Jun 2. | — |
| Pumpkin | May 12 | Jun 9–Jun 9 | 77 | no-fit: Needs 100 days; Lander has 77 after Jun 9. | — |
| Cauliflower | Apr 14 | May 19–Jun 2 | 126 | fits: 75 days to maturity, 126 available after May 19. | Jun 25 |
| Swiss Chard | Mar 31 | May 12–May 12 | 133 | two-plantings: Plant May 12 and again by Jul 15; both mature before Sep 22. | Jul 15 |
| Arugula | — | Mar 31–Jun 23 | 189 | two-plantings: Plant Mar 31 and again by Aug 13; both mature before Oct 6. | Aug 13 |
| Brussel Sprouts | Mar 31 | Apr 28–May 12 | 161 | fits: 100 days to maturity, 161 available after Apr 28. | Jun 14 |
| Butternut Squash | May 12 | Jun 9–Jun 16 | 77 | no-fit: Needs 100 days; Lander has 77 after Jun 9. | — |
| Eggplant | Apr 7 | Jun 9–Jun 16 | 70 | fits: 70 days to maturity, 70 available after Jun 9. | — |
| Okra | Apr 28 | Jun 2–Jun 9 | 91 | fits: 55 days to maturity, 91 available after Jun 2. | Jun 24 |
| Basil | Apr 21 | Jun 16–Jun 16 | 77 | fits: 60 days to maturity, 77 available after Jun 16. | Jun 19 |
| Cilantro | — | Apr 28–May 19 | 147 | two-plantings: Plant Apr 28 and again by Jul 20; both mature before Sep 22. | Jul 20 |
| Parsley | Mar 17 | Jun 2–Jun 9 | 112 | fits: 70 days to maturity, 112 available after Jun 2. | Jun 30 |
| Celery | Mar 17 | Jun 2–Jun 16 | 112 | head-start: Even planted out Jun 2, the outdoor season is about 8 days short; choose an early variety or grow under cover. | — |
| Scallions | Mar 17 | Apr 28–May 12 | 161 | two-plantings: Plant Apr 28 and again by Jul 24; both mature before Oct 6. | Jul 24 |
| Turnip | — | Apr 28–May 12 | 161 | two-plantings: Plant Apr 28 and again by Aug 3; both mature before Oct 6. | Aug 3 |
| Kohlrabi | — | Apr 14–Apr 28 | 175 | two-plantings: Plant Apr 14 and again by Jul 29; both mature before Oct 6. | Jul 29 |
| Bok Choy | Apr 28 | May 19–May 26 | 126 | two-plantings: Plant May 19 and again by Jul 25; both mature before Sep 22. | Jul 25 |
| Collards | Mar 17 | Apr 28–May 12 | 161 | two-plantings: Plant Apr 28 and again by Jul 24; both mature before Oct 6. | Jul 24 |
| Cantaloupe | May 12 | Jun 9–Jun 16 | 70 | head-start: Even planted out Jun 9, the outdoor season is about 15 days short; choose an early variety or grow under cover. | — |
| Chives | Mar 3 | Jun 2–Jun 9 | 126 | fits: 90 days to maturity, 126 available after Jun 2. | — |
| Dill | — | Mar 31–Jun 23 | 175 | two-plantings: Plant Mar 31 and again by Jul 15; both mature before Sep 22. | Jul 15 |
| Oregano | Mar 17 | Jun 2–Jun 9 | 126 | fits: 80 days to maturity, 126 available after Jun 2. | — |
| Rosemary | Mar 3 | Jun 2–Jun 9 | 112 | fits: 80 days to maturity, 112 available after Jun 2. | — |
| Sage | Mar 31 | Jun 2–Jun 9 | 126 | fits: 75 days to maturity, 126 available after Jun 2. | — |
| Thyme | Mar 17 | Jun 2–Jun 9 | 126 | fits: 90 days to maturity, 126 available after Jun 2. | — |
| Calendula | Apr 14 | May 12–May 26 | 133 | two-plantings: Plant May 12 and again by Jul 20; both mature before Sep 22. | Jul 20 |
| Cosmos | Apr 28 | May 26–Jun 9 | 98 | fits: 60 days to maturity, 98 available after May 26. | Jun 19 |
| Lavender | Mar 3 | May 26–Jun 9 | 133 | fits: 90 days to maturity, 133 available after May 26. | — |
| Marigolds | Apr 14 | May 26–Jun 2 | 98 | fits: 50 days to maturity, 98 available after May 26. | Jun 29 |
| Melons | May 12 | Jun 9–Jun 16 | 70 | head-start: Even planted out Jun 9, the outdoor season is about 15 days short; choose an early variety or grow under cover. | — |
| Mint | — | May 26–Jun 9 | 133 | fits: 90 days to maturity, 133 available after May 26. | — |
| Nasturtiums | Apr 28 | May 26–Jun 2 | 98 | fits: 55 days to maturity, 98 available after May 26. | Jun 24 |
| Pole Beans | — | Jun 2–Jun 16 | 91 | fits: 65 days to maturity, 91 available after Jun 2. | Jun 14 |
| Spaghetti Squash | May 12 | Jun 9–Jun 16 | 77 | head-start: Even planted out Jun 9, the outdoor season is about 13 days short; choose an early variety or grow under cover. | — |
| Sunflowers | — | May 26–Jun 9 | 98 | fits: 70 days to maturity, 98 available after May 26. | Jun 9 |
| Tomatillos | Mar 31 | Jun 2–Jun 9 | 77 | fits: 75 days to maturity, 77 available after Jun 2. | — |
| Watermelon | May 12 | Jun 2–Jun 9 | 77 | head-start: Even planted out Jun 2, the outdoor season is about 3 days short; choose an early variety or grow under cover. | — |
| Yellow Squash | May 12 | Jun 9–Jun 16 | 84 | fits: 55 days to maturity, 84 available after Jun 9. | Jun 24 |
| Zinnias | Apr 28 | May 26–Jun 9 | 98 | fits: 60 days to maturity, 98 available after May 26. | Jun 19 |
Month by month in Lander
| 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 3), Lavender (Mar 3), Onion (Mar 3), Rosemary (Mar 3), Celery (Mar 17), Collards (Mar 17), +12 more. Direct sow from: Arugula (Mar 31), Beets (Mar 31), Dill (Mar 31), Peas (Mar 31), Radish (Mar 31), Spinach (Mar 31). |
| April | Start indoors: Eggplant (Apr 7), Calendula (Apr 14), Cauliflower (Apr 14), Marigolds (Apr 14), Pepper (Apr 14), Basil (Apr 21), +7 more. Direct sow from: Kohlrabi (Apr 14), Cilantro (Apr 28), Turnip (Apr 28). Transplant from: Broccoli (Apr 28), Brussel Sprouts (Apr 28), Cabbage (Apr 28), Collards (Apr 28), Kale (Apr 28), Lettuce (Apr 28), +2 more. Plant: Strawberry (Apr 21). |
| May | Start indoors: Cucumber (May 5), Butternut Squash (May 12), Cantaloupe (May 12), Melons (May 12), Pumpkin (May 12), Spaghetti Squash (May 12), +3 more. Direct sow from: Carrots (May 5), Potatoes (May 12), Sunflowers (May 26). Transplant from: Calendula (May 12), Swiss Chard (May 12), Bok Choy (May 19), Cauliflower (May 19), Cosmos (May 26), Lavender (May 26), +4 more. Last frost around May 26. |
| June | Direct sow from: Beans (Jun 2), Pole Beans (Jun 2). Transplant from: Celery (Jun 2), Chives (Jun 2), Corn (Jun 2), Okra (Jun 2), Oregano (Jun 2), Parsley (Jun 2), +17 more. Last sowing dates: Sunflowers (Jun 9), Brussel Sprouts (Jun 14), Pole Beans (Jun 14), Basil (Jun 19), Cosmos (Jun 19), Cucumber (Jun 19), +10 more. |
| July | Last sowing dates: Peas (Jul 5), Cabbage (Jul 14), Carrots (Jul 14), Beets (Jul 15), Dill (Jul 15), Swiss Chard (Jul 15), +8 more. |
| August | Last sowing dates: Turnip (Aug 3), Arugula (Aug 13), Spinach (Aug 13), Radish (Aug 14). |
| September | Direct sow from: Garlic (Sep 15). First frost around September 15. |
| October | Last sowing dates: Garlic (Oct 6). |
| 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 Lander, WY (ZIP 82520)?
The median last spring frost date for Lander, WY (ZIP code 82520) is around May 26. 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 3; one in ten it runs past June 18.
What is the first fall frost date in Lander, WY?
The median first fall frost date for Lander, WY is around September 15. 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 September 3 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Lander, WY?
The frost-free growing season in Lander is about 112 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 Lander (112 frost-free days, a short season), 31 of 56 planner crops fit outright, 15 get two plantings, 7 need an indoor start, 2 don't reliably mature, 1 crop is perennial.
What USDA hardiness zone is Lander, WY?
Lander, 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 Lander, WY?
Start tomatoes indoors Apr 21 and plant out Jun 9 in Lander. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Lander?
Two: plant Apr 28 and again by Jul 25; both mature before Sep 22.
When do I plant garlic in Lander?
Sep 15 to Oct 6; it overwinters and is ready the following summer.
Can I grow Celery in Lander?
Yes, with help. Even planted out Jun 2, the outdoor season is about 8 days short; choose an early variety or grow under cover.
Which nearby ZIP has a longer season?
Riverton (ZIP 82501) has 123 frost-free days, 11 more than Lander (ZIP 82520). See Riverton ZIP 82501 frost dates
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- When to plant in WY
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