Frost dates for 82837Leiter, WY
The average last spring frost in Leiter is May 24 and the average first fall frost is September 16, giving a typical growing season of about 114 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 24
- Average first fall frost
- Sep 16
- Growing season
- 114 days
Safer after Jun 8 (1-in-10 risk)
Possible by Sep 3 (1-in-10 risk)
Last frost typically in 209 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 25 · Jun 7 · Jun 25 | Aug 26 · Sep 7 · Sep 20 | 90 days | 100% |
| Frost / freeze (32°F) | May 12 · May 24 · Jun 8 | Sep 3 · Sep 16 · Oct 1 | 114 days | 100% |
| Hard freeze (28°F) | Apr 30 · May 10 · May 23 | Sep 13 · Sep 27 · Oct 11 | 138 days | 100% |
Planting calendar for Leiter
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 23 – Jun 29 |
| Tomatoes | Transplant outdoors | Jun 9 – May 27 |
| Peppers | Start seeds indoors | Apr 23 – May 24 |
| Peppers | Transplant outdoors | Jun 23 – Jul 24 |
| Eggplant | Start seeds indoors | May 10 – Jun 8 |
| Eggplant | Transplant outdoors | Jun 23 – Jul 24 |
| Cucumbers | Sow outdoors | Jun 23 – Jun 6 |
| Summer squash | Sow outdoors | Jun 9 – Jul 24 |
| Winter squash & pumpkins | Sow outdoors | Jun 23 – Jul 24 |
| Snap beans | Sow outdoors | Jun 9 – Jun 29 |
| Sweet corn | Sow outdoors | Jun 9 – May 27 |
| Watermelon & cantaloupe | Sow outdoors | Jun 23 – Jul 24 |
| Okra | Sow outdoors | Jun 16 – Jul 9 |
| Peas | Sow outdoors (spring) | Apr 23 – Jun 8 |
| Potatoes | Plant outdoors (spring) | Apr 23 – Jun 23 |
| Onions | Start seeds indoors (spring) | Mar 12 – Apr 8 |
| Onions | Transplant outdoors (spring) | May 10 – Jun 8 |
| Broccoli | Start seeds indoors (spring) | Apr 5 – May 9 |
| Broccoli | Transplant outdoors (spring) | May 10 – Jun 8 |
| Broccoli | Start seeds indoors (fall) | May 17 – May 27 |
| Broccoli | Transplant outdoors (fall) | Jun 16 – Jun 27 |
| Cabbage | Start seeds indoors (spring) | Mar 26 – Apr 23 |
| Cabbage | Transplant outdoors (spring) | Apr 23 – May 24 |
| Cabbage | Start seeds indoors (fall) | May 7 – Jun 6 |
| Cabbage | Transplant outdoors (fall) | Jun 6 – Jul 7 |
| Leaf lettuce | Sow outdoors (spring) | Apr 23 – Jul 9 |
| Leaf lettuce | Sow outdoors (fall) | Jun 6 – Jul 23 |
| Spinach | Sow outdoors (spring) | Apr 16 – May 30 |
| Spinach | Sow outdoors (fall) | Jun 23 – Jul 28 |
| Radishes | Sow outdoors (spring) | Apr 23 – Jun 13 |
| Radishes | Sow outdoors (fall) | Jun 6 – Aug 7 |
| Kale | Sow outdoors (spring) | May 10 – May 30 |
| Kale | Sow outdoors (fall) | May 30 – Jul 7 |
| Carrots | Sow outdoors (spring) | May 24 – Jul 9 |
| Carrots | Sow outdoors (fall) | May 7 – Jun 22 |
| Garlic | Plant outdoors (fall) | Sep 6 – Oct 7 |
Where these dates come from
ZIP code 82837 is matched to the NOAA station Clearmont 5 Sw, WY, 21 km away, at 3,995 ft elevation (219 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Clearmont 5 Sw, WY (used) | 3,995 ft | May 24 | Sep 16 |
| Leiter 9N, WY | 4,160 ft | May 14 | Sep 30 |
| Echeta 2 Nw, WY | 4,000 ft | May 21 | Sep 23 |
| Sheridan Fld Stn, WY | 3,750 ft | May 18 | Sep 24 |
Frost dates near Leiter
- Arvada, WY 82831 · last May 21, first Sep 23
- Clearmont, WY 82835 · last May 24, first Sep 16
- Wyarno, WY 82845 · last May 21, first Sep 23
- Recluse, WY 82725 · last May 21, first Sep 23
- Otter, MT 59062 · last May 25, first Sep 19
- Banner, WY 82832 · last May 24, first Sep 21
- Story, WY 82842 · last May 24, first Sep 23
- Saddlestring, WY 82840 · last May 24, first Sep 23
Frequently asked questions
- When is the last frost in Leiter, WY?
- For ZIP code 82837, the average last spring frost (32°F) is May 24, based on NOAA 1991-2020 climate normals for the Clearmont 5 Sw, WY weather station. There is a 1-in-10 chance of a frost after June 8.
- When is the first frost in Leiter, WY?
- The average first fall frost (32°F) is September 16. There is a 1-in-10 chance of frost by September 3, so tender plants are at risk from that point on.
- How long is the growing season in 82837?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 114 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.