Frost dates for 82224Lost Springs, WY
The average last spring frost in Lost Springs is May 15 and the average first fall frost is September 27, giving a typical growing season of about 133 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 15
- Average first fall frost
- Sep 27
- Growing season
- 133 days
Safer after May 28 (1-in-10 risk)
Possible by Sep 13 (1-in-10 risk)
Last frost typically in 193 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 14 · May 27 · Jun 9 | Sep 3 · Sep 18 · Sep 30 | 112 days | 100% |
| Frost / freeze (32°F) | May 3 · May 15 · May 28 | Sep 13 · Sep 27 · Oct 9 | 133 days | 100% |
| Hard freeze (28°F) | Apr 19 · May 3 · May 16 | Sep 21 · Oct 6 · Oct 20 | 155 days | 100% |
Planting calendar for Lost Springs
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 14 – Jun 20 |
| Tomatoes | Transplant outdoors | May 31 – Jun 7 |
| Peppers | Start seeds indoors | Apr 14 – May 15 |
| Peppers | Transplant outdoors | Jun 14 – Jul 15 |
| Eggplant | Start seeds indoors | May 1 – May 30 |
| Eggplant | Transplant outdoors | Jun 14 – Jul 15 |
| Cucumbers | Sow outdoors | Jun 14 – Jun 17 |
| Summer squash | Sow outdoors | May 31 – Jul 15 |
| Winter squash & pumpkins | Sow outdoors | Jun 14 – Jul 15 |
| Snap beans | Sow outdoors | May 31 – Jul 10 |
| Sweet corn | Sow outdoors | May 31 – Jun 7 |
| Watermelon & cantaloupe | Sow outdoors | Jun 14 – Jul 15 |
| Okra | Sow outdoors | Jun 7 – Jun 30 |
| Peas | Sow outdoors (spring) | Apr 14 – May 30 |
| Potatoes | Plant outdoors (spring) | Apr 14 – Jun 14 |
| Onions | Start seeds indoors (spring) | Mar 3 – Mar 30 |
| Onions | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (spring) | Mar 27 – Apr 30 |
| Broccoli | Transplant outdoors (spring) | May 1 – May 30 |
| Broccoli | Start seeds indoors (fall) | May 28 – Jun 7 |
| Broccoli | Transplant outdoors (fall) | Jun 27 – Jul 8 |
| Cabbage | Start seeds indoors (spring) | Mar 17 – Apr 14 |
| Cabbage | Transplant outdoors (spring) | Apr 14 – May 15 |
| Cabbage | Start seeds indoors (fall) | May 18 – Jun 17 |
| Cabbage | Transplant outdoors (fall) | Jun 17 – Jul 18 |
| Leaf lettuce | Sow outdoors (spring) | Apr 14 – Jun 30 |
| Leaf lettuce | Sow outdoors (fall) | Jun 17 – Aug 3 |
| Spinach | Sow outdoors (spring) | Apr 7 – May 21 |
| Spinach | Sow outdoors (fall) | Jul 4 – Aug 8 |
| Radishes | Sow outdoors (spring) | Apr 14 – Jun 4 |
| Radishes | Sow outdoors (fall) | Jun 17 – Aug 18 |
| Kale | Sow outdoors (spring) | May 1 – May 21 |
| Kale | Sow outdoors (fall) | Jun 10 – Jul 18 |
| Carrots | Sow outdoors (spring) | May 15 – Jun 30 |
| Carrots | Sow outdoors (fall) | May 18 – Jul 3 |
| Garlic | Plant outdoors (fall) | Sep 17 – Oct 18 |
Where these dates come from
ZIP code 82224 is matched to the NOAA station Dull Ctr 1Se, WY, 43.2 km away, at 4,415 ft elevation (257 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Dull Ctr 1Se, WY (used) | 4,415 ft | May 15 | Sep 27 |
| Lance Creek 11Nne, WY | 4,204 ft | May 17 | Sep 25 |
| Lusk 2 Sw, WY | 5,090 ft | May 23 | Sep 20 |
| Redbird, WY | 3,890 ft | May 16 | Sep 24 |
Frost dates near Lost Springs
- Lance Creek, WY 82222 · last May 17, first Sep 25
- Manville, WY 82227 · last May 23, first Sep 20
- Shawnee, WY 82229 · last May 23, first Sep 22
- Lusk, WY 82225 · last May 23, first Sep 20
- Douglas, WY 82633 · last May 19, first Sep 23
- Glendo, WY 82213 · last May 9, first Oct 5
- Jay Em, WY 82219 · last May 17, first Sep 28
- Van Tassell, WY 82242 · last May 20, first Sep 21
Frequently asked questions
- When is the last frost in Lost Springs, WY?
- For ZIP code 82224, the average last spring frost (32°F) is May 15, based on NOAA 1991-2020 climate normals for the Dull Ctr 1Se, WY weather station. There is a 1-in-10 chance of a frost after May 28.
- When is the first frost in Lost Springs, WY?
- The average first fall frost (32°F) is September 27. There is a 1-in-10 chance of frost by September 13, so tender plants are at risk from that point on.
- How long is the growing season in 82224?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 133 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.