Frost dates for 84317Huntsville, UT
The average last spring frost in Huntsville is May 22 and the average first fall frost is September 26, giving a typical growing season of about 125 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 22
- Average first fall frost
- Sep 26
- Growing season
- 125 days
Safer after Jun 8 (1-in-10 risk)
Possible by Sep 11 (1-in-10 risk)
Last frost typically in 200 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 24 · Jun 9 · Jun 24 | Aug 31 · Sep 14 · Sep 28 | 96 days | 100% |
| Frost / freeze (32°F) | May 7 · May 22 · Jun 8 | Sep 11 · Sep 26 · Oct 9 | 125 days | 100% |
| Hard freeze (28°F) | Apr 21 · May 4 · May 20 | Sep 23 · Oct 6 · Oct 22 | 154 days | 100% |
Planting calendar for Huntsville
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 6 |
| 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 16 |
| Summer squash | Sow outdoors | Jun 7 – Jul 22 |
| Winter squash & pumpkins | Sow outdoors | Jun 21 – Jul 22 |
| Snap beans | Sow outdoors | Jun 7 – Jul 9 |
| Sweet corn | Sow outdoors | Jun 7 – Jun 6 |
| 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 27 – Jun 6 |
| Broccoli | Transplant outdoors (fall) | Jun 26 – Jul 7 |
| Cabbage | Start seeds indoors (spring) | Mar 24 – Apr 21 |
| Cabbage | Transplant outdoors (spring) | Apr 21 – May 22 |
| Cabbage | Start seeds indoors (fall) | May 17 – Jun 16 |
| Cabbage | Transplant outdoors (fall) | Jun 16 – Jul 17 |
| Leaf lettuce | Sow outdoors (spring) | Apr 21 – Jul 7 |
| Leaf lettuce | Sow outdoors (fall) | Jun 16 – Aug 2 |
| Spinach | Sow outdoors (spring) | Apr 14 – May 28 |
| Spinach | Sow outdoors (fall) | Jul 3 – Aug 7 |
| Radishes | Sow outdoors (spring) | Apr 21 – Jun 11 |
| Radishes | Sow outdoors (fall) | Jun 16 – Aug 17 |
| Kale | Sow outdoors (spring) | May 8 – May 28 |
| Kale | Sow outdoors (fall) | Jun 9 – Jul 17 |
| Carrots | Sow outdoors (spring) | May 22 – Jul 7 |
| Carrots | Sow outdoors (fall) | May 17 – Jul 2 |
| Garlic | Plant outdoors (fall) | Sep 16 – Oct 17 |
Where these dates come from
ZIP code 84317 is matched to the NOAA station Pineview Dam, UT, 6.5 km away, at 4,940 ft elevation (1 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Pineview Dam, UT (used) | 4,940 ft | May 22 | Sep 26 |
| Huntsville Monastery, UT | 5,140 ft | Jun 4 | Sep 16 |
| Eden-Liberty, UT | 5,195 ft | May 25 | Sep 26 |
| Ogden Ne Bench, UT | 4,572 ft | Apr 19 | Oct 22 |
Frost dates near Huntsville
- Eden, UT 84310 · last May 22, first Sep 26
- Ogden, UT 84244 · last Apr 21, first Oct 23
- Morgan, UT 84050 · last May 25, first Sep 24
- Layton, UT 84040 · last Apr 22, first Oct 22
- Hill Afb, UT 84056 · last Apr 22, first Oct 22
- Roy, UT 84067 · last Apr 22, first Oct 22
- Willard, UT 84340 · last Apr 21, first Oct 23
- Clearfield, UT 84016 · last Apr 22, first Oct 22
Frequently asked questions
- When is the last frost in Huntsville, UT?
- For ZIP code 84317, the average last spring frost (32°F) is May 22, based on NOAA 1991-2020 climate normals for the Pineview Dam, UT weather station. There is a 1-in-10 chance of a frost after June 8.
- When is the first frost in Huntsville, UT?
- The average first fall frost (32°F) is September 26. 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 84317?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 125 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.