Frost dates for 82401Worland, WY
The average last spring frost in Worland is May 4 and the average first fall frost is October 1, giving a typical growing season of about 149 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 4
- Average first fall frost
- Oct 1
- Growing season
- 149 days
Safer after May 18 (1-in-10 risk)
Possible by Sep 21 (1-in-10 risk)
Last frost typically in 182 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 4 · May 16 · May 29 | Sep 9 · Sep 22 · Oct 3 | 129 days | 100% |
| Frost / freeze (32°F) | Apr 23 · May 4 · May 18 | Sep 21 · Oct 1 · Oct 15 | 149 days | 100% |
| Hard freeze (28°F) | Apr 10 · Apr 24 · May 8 | Sep 30 · Oct 13 · Oct 25 | 171 days | 100% |
Planting calendar for Worland
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 3 – Jun 9 |
| Tomatoes | Transplant outdoors | May 20 – Jun 11 |
| Peppers | Start seeds indoors | Apr 3 – May 4 |
| Peppers | Transplant outdoors | Jun 3 – Jul 4 |
| Eggplant | Start seeds indoors | Apr 20 – May 19 |
| Eggplant | Transplant outdoors | Jun 3 – Jul 4 |
| Cucumbers | Sow outdoors | Jun 3 – Jun 21 |
| Summer squash | Sow outdoors | May 20 – Jul 4 |
| Winter squash & pumpkins | Sow outdoors | Jun 3 – Jul 4 |
| Snap beans | Sow outdoors | May 20 – Jul 14 |
| Sweet corn | Sow outdoors | May 20 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 3 – Jul 4 |
| Okra | Sow outdoors | May 27 – Jun 19 |
| Peas | Sow outdoors (spring) | Apr 3 – May 19 |
| Potatoes | Plant outdoors (spring) | Apr 3 – Jun 3 |
| Onions | Start seeds indoors (spring) | Feb 20 – Mar 19 |
| Onions | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (spring) | Mar 16 – Apr 19 |
| Broccoli | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 6 – Apr 3 |
| Cabbage | Transplant outdoors (spring) | Apr 3 – May 4 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 3 – Jun 19 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Mar 27 – May 10 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 3 – May 24 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | Apr 20 – May 10 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 4 – Jun 19 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 82401 is matched to the NOAA station Worland, WY, 1 km away, at 4,058 ft elevation (10 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Worland, WY (used) | 4,058 ft | May 4 | Oct 1 |
| Worland, WY | 4,172 ft | May 13 | Sep 26 |
| Thermopolis 9Ne, WY | 4,282 ft | May 24 | Sep 16 |
| Basin, WY | 3,840 ft | Apr 28 | Oct 10 |
Frost dates near Worland
- Manderson, WY 82432 · last Apr 28, first Oct 10
- Kirby, WY 82430 · last May 5, first Oct 5
- Hyattville, WY 82428 · last May 10, first Oct 1
- Basin, WY 82410 · last Apr 28, first Oct 10
- Thermopolis, WY 82443 · last May 5, first Oct 5
- Ten Sleep, WY 82442 · last May 10, first Oct 1
- Otto, WY 82434 · last May 12, first Sep 28
- Greybull, WY 82426 · last May 4, first Oct 1
Frequently asked questions
- When is the last frost in Worland, WY?
- For ZIP code 82401, the average last spring frost (32°F) is May 4, based on NOAA 1991-2020 climate normals for the Worland, WY weather station. There is a 1-in-10 chance of a frost after May 18.
- When is the first frost in Worland, WY?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 21, so tender plants are at risk from that point on.
- How long is the growing season in 82401?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 149 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.