Frost dates for 84639Levan, UT
The average last spring frost in Levan is May 10 and the average first fall frost is October 7, giving a typical growing season of about 148 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 10
- Average first fall frost
- Oct 7
- Growing season
- 148 days
Safer after May 31 (1-in-10 risk)
Possible by Sep 24 (1-in-10 risk)
Last frost typically in 195 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 9 · May 26 · Jun 12 | Sep 13 · Sep 27 · Oct 10 | 122 days | 100% |
| Frost / freeze (32°F) | Apr 26 · May 10 · May 31 | Sep 24 · Oct 7 · Oct 21 | 148 days | 100% |
| Hard freeze (28°F) | Apr 12 · Apr 27 · May 13 | Oct 3 · Oct 18 · Nov 1 | 172 days | 100% |
Planting calendar for Levan
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 9 – Jun 15 |
| Tomatoes | Transplant outdoors | May 26 – Jun 17 |
| Peppers | Start seeds indoors | Apr 9 – May 10 |
| Peppers | Transplant outdoors | Jun 9 – Jul 10 |
| Eggplant | Start seeds indoors | Apr 26 – May 25 |
| Eggplant | Transplant outdoors | Jun 9 – Jul 10 |
| Cucumbers | Sow outdoors | Jun 9 – Jun 27 |
| Summer squash | Sow outdoors | May 26 – Jul 10 |
| Winter squash & pumpkins | Sow outdoors | Jun 9 – Jul 10 |
| Snap beans | Sow outdoors | May 26 – Jul 20 |
| Sweet corn | Sow outdoors | May 26 – Jun 17 |
| Watermelon & cantaloupe | Sow outdoors | Jun 9 – Jul 10 |
| Okra | Sow outdoors | Jun 2 – Jun 25 |
| Peas | Sow outdoors (spring) | Apr 9 – May 25 |
| Potatoes | Plant outdoors (spring) | Apr 9 – Jun 9 |
| Onions | Start seeds indoors (spring) | Feb 26 – Mar 25 |
| Onions | Transplant outdoors (spring) | Apr 26 – May 25 |
| Broccoli | Start seeds indoors (spring) | Mar 22 – Apr 25 |
| Broccoli | Transplant outdoors (spring) | Apr 26 – May 25 |
| Broccoli | Start seeds indoors (fall) | Jun 7 – Jun 17 |
| Broccoli | Transplant outdoors (fall) | Jul 7 – Jul 18 |
| Cabbage | Start seeds indoors (spring) | Mar 12 – Apr 9 |
| Cabbage | Transplant outdoors (spring) | Apr 9 – May 10 |
| Cabbage | Start seeds indoors (fall) | May 28 – Jun 27 |
| Cabbage | Transplant outdoors (fall) | Jun 27 – Jul 28 |
| Leaf lettuce | Sow outdoors (spring) | Apr 9 – Jun 25 |
| Leaf lettuce | Sow outdoors (fall) | Jun 27 – Aug 13 |
| Spinach | Sow outdoors (spring) | Apr 2 – May 16 |
| Spinach | Sow outdoors (fall) | Jul 14 – Aug 18 |
| Radishes | Sow outdoors (spring) | Apr 9 – May 30 |
| Radishes | Sow outdoors (fall) | Jun 27 – Aug 28 |
| Kale | Sow outdoors (spring) | Apr 26 – May 16 |
| Kale | Sow outdoors (fall) | Jun 20 – Jul 28 |
| Carrots | Sow outdoors (spring) | May 10 – Jun 25 |
| Carrots | Sow outdoors (fall) | May 28 – Jul 13 |
| Garlic | Plant outdoors (fall) | Sep 27 – Oct 28 |
Where these dates come from
ZIP code 84639 is matched to the NOAA station Levan, UT, 8 km away, at 5,298 ft elevation (193 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Levan, UT (used) | 5,298 ft | May 10 | Oct 7 |
| Nephi, UT | 5,146 ft | May 6 | Oct 10 |
| Moroni, UT | 5,580 ft | May 26 | Sep 25 |
| Scipio, UT | 5,314 ft | May 22 | Sep 25 |
Frost dates near Levan
- Nephi, UT 84648 · last May 6, first Oct 10
- Wales, UT 84667 · last May 26, first Sep 25
- Fountain Green, UT 84632 · last May 26, first Sep 25
- Leamington, UT 84638 · last May 2, first Oct 13
- Moroni, UT 84646 · last May 26, first Sep 25
- Chester, UT 84623 · last May 26, first Sep 25
- Fayette, UT 84630 · last May 22, first Sep 25
- Scipio, UT 84656 · last May 22, first Sep 25
Frequently asked questions
- When is the last frost in Levan, UT?
- For ZIP code 84639, the average last spring frost (32°F) is May 10, based on NOAA 1991-2020 climate normals for the Levan, UT weather station. There is a 1-in-10 chance of a frost after May 31.
- When is the first frost in Levan, UT?
- The average first fall frost (32°F) is October 7. There is a 1-in-10 chance of frost by September 24, so tender plants are at risk from that point on.
- How long is the growing season in 84639?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 148 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.