Frost dates for 84757New Harmony, UT
The average last spring frost in New Harmony is May 9 and the average first fall frost is October 11, giving a typical growing season of about 155 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 9
- Average first fall frost
- Oct 11
- Growing season
- 155 days
Safer after May 29 (1-in-10 risk)
Possible by Sep 27 (1-in-10 risk)
Last frost typically in 194 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 7 · May 26 · Jun 10 | Sep 18 · Oct 1 · Oct 14 | 128 days | 100% |
| Frost / freeze (32°F) | Apr 23 · May 9 · May 29 | Sep 27 · Oct 11 · Oct 25 | 155 days | 100% |
| Hard freeze (28°F) | Apr 5 · Apr 24 · May 13 | Oct 5 · Oct 22 · Nov 6 | 181 days | 100% |
Planting calendar for New Harmony
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 8 – Jun 14 |
| Tomatoes | Transplant outdoors | May 25 – Jun 21 |
| Peppers | Start seeds indoors | Apr 8 – May 9 |
| Peppers | Transplant outdoors | Jun 8 – Jul 9 |
| Eggplant | Start seeds indoors | Apr 25 – May 24 |
| Eggplant | Transplant outdoors | Jun 8 – Jul 9 |
| Cucumbers | Sow outdoors | Jun 8 – Jul 1 |
| Summer squash | Sow outdoors | May 25 – Jul 9 |
| Winter squash & pumpkins | Sow outdoors | Jun 8 – Jul 9 |
| Snap beans | Sow outdoors | May 25 – Jul 24 |
| Sweet corn | Sow outdoors | May 25 – Jun 21 |
| Watermelon & cantaloupe | Sow outdoors | Jun 8 – Jul 9 |
| Okra | Sow outdoors | Jun 1 – Jun 24 |
| Peas | Sow outdoors (spring) | Apr 8 – May 24 |
| Potatoes | Plant outdoors (spring) | Apr 8 – Jun 8 |
| Onions | Start seeds indoors (spring) | Feb 25 – Mar 24 |
| Onions | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (spring) | Mar 21 – Apr 24 |
| Broccoli | Transplant outdoors (spring) | Apr 25 – May 24 |
| Broccoli | Start seeds indoors (fall) | Jun 11 – Jun 21 |
| Broccoli | Transplant outdoors (fall) | Jul 11 – Jul 22 |
| Cabbage | Start seeds indoors (spring) | Mar 11 – Apr 8 |
| Cabbage | Transplant outdoors (spring) | Apr 8 – May 9 |
| Cabbage | Start seeds indoors (fall) | Jun 1 – Jul 1 |
| Cabbage | Transplant outdoors (fall) | Jul 1 – Aug 1 |
| Leaf lettuce | Sow outdoors (spring) | Apr 8 – Jun 24 |
| Leaf lettuce | Sow outdoors (fall) | Jul 1 – Aug 17 |
| Spinach | Sow outdoors (spring) | Apr 1 – May 15 |
| Spinach | Sow outdoors (fall) | Jul 18 – Aug 22 |
| Radishes | Sow outdoors (spring) | Apr 8 – May 29 |
| Radishes | Sow outdoors (fall) | Jul 1 – Sep 1 |
| Kale | Sow outdoors (spring) | Apr 25 – May 15 |
| Kale | Sow outdoors (fall) | Jun 24 – Aug 1 |
| Carrots | Sow outdoors (spring) | May 9 – Jun 24 |
| Carrots | Sow outdoors (fall) | Jun 1 – Jul 17 |
| Garlic | Plant outdoors (fall) | Oct 1 – Nov 1 |
Where these dates come from
ZIP code 84757 is matched to the NOAA station New Harmony, UT, 2.1 km away, at 5,167 ft elevation (75 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| New Harmony, UT (used) | 5,167 ft | May 9 | Oct 11 |
| La Verkin, UT | 3,194 ft | Apr 1 | Nov 5 |
| Cedar City, UT | 6,090 ft | May 4 | Oct 13 |
| Cedar City Muni Ap, UT | 5,586 ft | May 21 | Sep 29 |
Frost dates near New Harmony
- Kanarraville, UT 84742 · last May 21, first Sep 29
- Toquerville, UT 84774 · last Apr 1, first Nov 5
- Pine Valley, UT 84781 · last May 4, first Oct 13
- La Verkin, UT 84745 · last Apr 13, first Nov 2
- Leeds, UT 84746 · last Apr 1, first Nov 5
- Virgin, UT 84779 · last Apr 1, first Nov 5
- Cedar City, UT 84720 · last May 4, first Oct 13
- Central, UT 84722 · last May 9, first Oct 11
Frequently asked questions
- When is the last frost in New Harmony, UT?
- For ZIP code 84757, the average last spring frost (32°F) is May 9, based on NOAA 1991-2020 climate normals for the New Harmony, UT weather station. There is a 1-in-10 chance of a frost after May 29.
- When is the first frost in New Harmony, UT?
- The average first fall frost (32°F) is October 11. There is a 1-in-10 chance of frost by September 27, so tender plants are at risk from that point on.
- How long is the growing season in 84757?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 155 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.