Frost dates for 84031Hanna, UT
The average last spring frost in Hanna is June 5 and the average first fall frost is September 17, giving a typical growing season of about 100 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Jun 5
- Average first fall frost
- Sep 17
- Growing season
- 100 days
Safer after Jun 23 (1-in-10 risk)
Possible by Sep 1 (1-in-10 risk)
Last frost typically in 221 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) | — | — | 77 days | 100% |
| Frost / freeze (32°F) | May 20 · Jun 5 · Jun 23 | Sep 1 · Sep 17 · Oct 1 | 100 days | 100% |
| Hard freeze (28°F) | May 1 · May 19 · Jun 6 | Sep 11 · Sep 27 · Oct 12 | 130 days | 100% |
Planting calendar for Hanna
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 | May 5 – Jul 11 |
| Tomatoes | Transplant outdoors | Jun 21 – May 28 |
| Peppers | Start seeds indoors | May 5 – Jun 5 |
| Peppers | Transplant outdoors | Jul 5 – Aug 5 |
| Eggplant | Start seeds indoors | May 22 – Jun 20 |
| Eggplant | Transplant outdoors | Jul 5 – Aug 5 |
| Cucumbers | Sow outdoors | Jul 5 – Jun 7 |
| Summer squash | Sow outdoors | Jun 21 – Aug 5 |
| Winter squash & pumpkins | Sow outdoors | Jul 5 – Aug 5 |
| Snap beans | Sow outdoors | Jun 21 – Jun 30 |
| Sweet corn | Sow outdoors | Jun 21 – May 28 |
| Watermelon & cantaloupe | Sow outdoors | Jul 5 – Aug 5 |
| Okra | Sow outdoors | Jun 28 – Jul 21 |
| Peas | Sow outdoors (spring) | May 5 – Jun 20 |
| Potatoes | Plant outdoors (spring) | May 5 – Jul 5 |
| Onions | Start seeds indoors (spring) | Mar 24 – Apr 20 |
| Onions | Transplant outdoors (spring) | May 22 – Jun 20 |
| Broccoli | Start seeds indoors (spring) | Apr 17 – May 21 |
| Broccoli | Transplant outdoors (spring) | May 22 – Jun 20 |
| Broccoli | Start seeds indoors (fall) | May 18 – May 28 |
| Broccoli | Transplant outdoors (fall) | Jun 17 – Jun 28 |
| Cabbage | Start seeds indoors (spring) | Apr 7 – May 5 |
| Cabbage | Transplant outdoors (spring) | May 5 – Jun 5 |
| Cabbage | Start seeds indoors (fall) | May 8 – Jun 7 |
| Cabbage | Transplant outdoors (fall) | Jun 7 – Jul 8 |
| Leaf lettuce | Sow outdoors (spring) | May 5 – Jul 21 |
| Leaf lettuce | Sow outdoors (fall) | Jun 7 – Jul 24 |
| Spinach | Sow outdoors (spring) | Apr 28 – Jun 11 |
| Spinach | Sow outdoors (fall) | Jun 24 – Jul 29 |
| Radishes | Sow outdoors (spring) | May 5 – Jun 25 |
| Radishes | Sow outdoors (fall) | Jun 7 – Aug 8 |
| Kale | Sow outdoors (spring) | May 22 – Jun 11 |
| Kale | Sow outdoors (fall) | May 31 – Jul 8 |
| Carrots | Sow outdoors (spring) | Jun 5 – Jul 21 |
| Carrots | Sow outdoors (fall) | May 8 – Jun 23 |
| Garlic | Plant outdoors (fall) | Sep 7 – Oct 8 |
Where these dates come from
ZIP code 84031 is matched to the NOAA station Kamas, UT, 45.4 km away, at 6,481 ft elevation (619 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Kamas, UT (used) | 6,481 ft | Jun 5 | Sep 17 |
| Moon Lake, UT | 8,125 ft | Jun 11 | Sep 18 |
| Altamont, UT | 6,456 ft | May 31 | Sep 23 |
| Duchesne, UT | 5,551 ft | May 6 | Oct 5 |
Frost dates near Hanna
- Tabiona, UT 84072 · last May 31, first Sep 23
- Fruitland, UT 84027 · last Jun 15, first Sep 12
- Mountain Home, UT 84051 · last May 31, first Sep 23
- Talmage, UT 84073 · last May 31, first Sep 23
- Kamas, UT 84036 · last Jun 5, first Sep 17
- Altonah, UT 84002 · last May 31, first Sep 23
- Altamont, UT 84001 · last May 31, first Sep 23
- Duchesne, UT 84021 · last May 6, first Oct 5
Frequently asked questions
- When is the last frost in Hanna, UT?
- For ZIP code 84031, the average last spring frost (32°F) is June 5, based on NOAA 1991-2020 climate normals for the Kamas, UT weather station. There is a 1-in-10 chance of a frost after June 23.
- When is the first frost in Hanna, UT?
- The average first fall frost (32°F) is September 17. There is a 1-in-10 chance of frost by September 1, so tender plants are at risk from that point on.
- How long is the growing season in 84031?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 100 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.