Frost dates for 82938Mc Kinnon, WY
The average last spring frost in Mc Kinnon is May 22 and the average first fall frost is September 29, giving a typical growing season of about 128 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Sep 29
- Growing season
- 128 days
Safer after Jun 11 (1-in-10 risk)
Possible by Sep 15 (1-in-10 risk)
Last frost typically in 207 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 19 · Jun 5 · Jun 21 | Sep 6 · Sep 20 · Oct 1 | 103 days | 100% |
| Frost / freeze (32°F) | May 4 · May 22 · Jun 11 | Sep 15 · Sep 29 · Oct 14 | 128 days | 100% |
| Hard freeze (28°F) | Apr 21 · May 5 · May 27 | Sep 25 · Oct 11 · Oct 23 | 157 days | 100% |
Planting calendar for Mc Kinnon
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 21 – Jun 27 |
| Tomatoes | Transplant outdoors | Jun 7 – Jun 9 |
| Peppers | Start seeds indoors | Apr 21 – May 22 |
| Peppers | Transplant outdoors | Jun 21 – Jul 22 |
| Eggplant | Start seeds indoors | May 8 – Jun 6 |
| Eggplant | Transplant outdoors | Jun 21 – Jul 22 |
| Cucumbers | Sow outdoors | Jun 21 – Jun 19 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jul 12 |
| Sweet corn | Sow outdoors | Jun 7 – Jun 9 |
| Watermelon & cantaloupe | Sow outdoors | Jun 21 – Jul 22 |
| Okra | Sow outdoors | Jun 14 – Jul 7 |
| Peas | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Potatoes | Plant outdoors (spring) | Apr 21 – Jun 21 |
| Onions | Start seeds indoors (spring) | Mar 10 – Apr 6 |
| Onions | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (spring) | Apr 3 – May 7 |
| Broccoli | Transplant outdoors (spring) | May 8 – Jun 6 |
| Broccoli | Start seeds indoors (fall) | May 30 – Jun 9 |
| Broccoli | Transplant outdoors (fall) | Jun 29 – Jul 10 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | May 20 – Jun 19 |
| Cabbage | Transplant outdoors (fall) | Jun 19 – Jul 20 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | Jun 19 – Aug 5 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | Jul 6 – Aug 10 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | Jun 19 – Aug 20 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | Jun 12 – Jul 20 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | May 20 – Jul 5 |
| Garlic | Plant outdoors (fall) | Sep 19 – Oct 20 |
Where these dates come from
ZIP code 82938 is matched to the NOAA station Manila, UT, 13.7 km away, at 6,393 ft elevation (546 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Manila, UT (used) | 6,393 ft | May 22 | Sep 29 |
| Buckboard Marina, WY | 6,080 ft | May 24 | Sep 23 |
| Flaming Gorge, UT | 6,244 ft | May 26 | Sep 23 |
| Church Buttes Gas Plt, WY | 7,079 ft | May 25 | Sep 27 |
Frost dates near Mc Kinnon
- Manila, UT 84046 · last May 22, first Sep 29
- Lonetree, WY 82936 · last May 25, first Sep 27
- Dutch John, UT 84023 · last May 26, first Sep 23
- Mountain View, WY 82939 · last Jun 14, first Sep 9
- Lyman, WY 82937 · last Jun 14, first Sep 9
- Fort Bridger, WY 82933 · last Jun 14, first Sep 9
- Robertson, WY 82944 · last Jun 11, first Sep 18
- Little America, WY 82929 · last May 24, first Sep 22
Frequently asked questions
- When is the last frost in Mc Kinnon, WY?
- For ZIP code 82938, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Manila, UT weather station. There is a 1-in-10 chance of a frost after June 11.
- When is the first frost in Mc Kinnon, WY?
- The average first fall frost (32°F) is September 29. There is a 1-in-10 chance of frost by September 15, so tender plants are at risk from that point on.
- How long is the growing season in 82938?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 128 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.