Frost dates for 82515Hudson, WY
The average last spring frost in Hudson is May 12 and the average first fall frost is September 24, giving a typical growing season of about 132 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 12
- Average first fall frost
- Sep 24
- Growing season
- 132 days
Safer after May 26 (1-in-10 risk)
Possible by Sep 11 (1-in-10 risk)
Last frost typically in 197 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 12 · May 28 · Jun 10 | Sep 3 · Sep 14 · Sep 27 | 109 days | 100% |
| Frost / freeze (32°F) | May 1 · May 12 · May 26 | Sep 11 · Sep 24 · Oct 7 | 132 days | 100% |
| Hard freeze (28°F) | Apr 20 · May 1 · May 16 | Sep 21 · Oct 4 · Oct 17 | 154 days | 100% |
Planting calendar for Hudson
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 11 – Jun 17 |
| Tomatoes | Transplant outdoors | May 28 – Jun 4 |
| Peppers | Start seeds indoors | Apr 11 – May 12 |
| Peppers | Transplant outdoors | Jun 11 – Jul 12 |
| Eggplant | Start seeds indoors | Apr 28 – May 27 |
| Eggplant | Transplant outdoors | Jun 11 – Jul 12 |
| Cucumbers | Sow outdoors | Jun 11 – Jun 14 |
| Summer squash | Sow outdoors | May 28 – Jul 12 |
| Winter squash & pumpkins | Sow outdoors | Jun 11 – Jul 12 |
| Snap beans | Sow outdoors | May 28 – Jul 7 |
| Sweet corn | Sow outdoors | May 28 – Jun 4 |
| Watermelon & cantaloupe | Sow outdoors | Jun 11 – Jul 12 |
| Okra | Sow outdoors | Jun 4 – Jun 27 |
| Peas | Sow outdoors (spring) | Apr 11 – May 27 |
| Potatoes | Plant outdoors (spring) | Apr 11 – Jun 11 |
| Onions | Start seeds indoors (spring) | Feb 28 – Mar 27 |
| Onions | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (spring) | Mar 24 – Apr 27 |
| Broccoli | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (fall) | May 25 – Jun 4 |
| Broccoli | Transplant outdoors (fall) | Jun 24 – Jul 5 |
| Cabbage | Start seeds indoors (spring) | Mar 14 – Apr 11 |
| Cabbage | Transplant outdoors (spring) | Apr 11 – May 12 |
| Cabbage | Start seeds indoors (fall) | May 15 – Jun 14 |
| Cabbage | Transplant outdoors (fall) | Jun 14 – Jul 15 |
| Leaf lettuce | Sow outdoors (spring) | Apr 11 – Jun 27 |
| Leaf lettuce | Sow outdoors (fall) | Jun 14 – Jul 31 |
| Spinach | Sow outdoors (spring) | Apr 4 – May 18 |
| Spinach | Sow outdoors (fall) | Jul 1 – Aug 5 |
| Radishes | Sow outdoors (spring) | Apr 11 – Jun 1 |
| Radishes | Sow outdoors (fall) | Jun 14 – Aug 15 |
| Kale | Sow outdoors (spring) | Apr 28 – May 18 |
| Kale | Sow outdoors (fall) | Jun 7 – Jul 15 |
| Carrots | Sow outdoors (spring) | May 12 – Jun 27 |
| Carrots | Sow outdoors (fall) | May 15 – Jun 30 |
| Garlic | Plant outdoors (fall) | Sep 14 – Oct 15 |
Where these dates come from
ZIP code 82515 is matched to the NOAA station Riverton, WY, 21.9 km away, at 4,955 ft elevation (127 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Riverton, WY (used) | 4,955 ft | May 12 | Sep 24 |
| Lander Hunt Fld Ap, WY | 5,592 ft | May 18 | Sep 27 |
| Riverton, WY | 5,568 ft | May 16 | Sep 28 |
| Lander 11 Sse, WY | 5,773 ft | May 13 | Oct 2 |
Frost dates near Hudson
- Lander, WY 82520 · last May 12, first Sep 24
- Arapahoe, WY 82510 · last May 12, first Sep 24
- Saint Stephens, WY 82524 · last May 12, first Sep 24
- Fort Washakie, WY 82514 · last May 18, first Sep 27
- Riverton, WY 82501 · last May 12, first Sep 24
- Kinnear, WY 82516 · last May 21, first Sep 20
- Pavillion, WY 82523 · last May 14, first Sep 30
- Shoshoni, WY 82649 · last May 7, first Oct 3
Frequently asked questions
- When is the last frost in Hudson, WY?
- For ZIP code 82515, the average last spring frost (32°F) is May 12, based on NOAA 1991-2020 climate normals for the Riverton, WY weather station. There is a 1-in-10 chance of a frost after May 26.
- When is the first frost in Hudson, WY?
- The average first fall frost (32°F) is September 24. There is a 1-in-10 chance of frost by September 11, so tender plants are at risk from that point on.
- How long is the growing season in 82515?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 132 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.