Frost dates for 84749Lyman, UT
The average last spring frost in Lyman is May 31 and the average first fall frost is September 21, giving a typical growing season of about 112 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 31
- Average first fall frost
- Sep 21
- Growing season
- 112 days
Safer after Jun 14 (1-in-10 risk)
Possible by Sep 8 (1-in-10 risk)
Last frost typically in 216 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) | Jun 1 · Jun 12 · Jun 24 | Aug 31 · Sep 12 · Sep 22 | 90 days | 100% |
| Frost / freeze (32°F) | May 15 · May 31 · Jun 14 | Sep 8 · Sep 21 · Oct 1 | 112 days | 100% |
| Hard freeze (28°F) | May 1 · May 18 · Jun 3 | Sep 18 · Sep 29 · Oct 11 | 134 days | 100% |
Planting calendar for Lyman
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 30 – Jul 6 |
| Tomatoes | Transplant outdoors | Jun 16 – Jun 1 |
| Peppers | Start seeds indoors | Apr 30 – May 31 |
| Peppers | Transplant outdoors | Jun 30 – Jul 31 |
| Eggplant | Start seeds indoors | May 17 – Jun 15 |
| Eggplant | Transplant outdoors | Jun 30 – Jul 31 |
| Cucumbers | Sow outdoors | Jun 30 – Jun 11 |
| Summer squash | Sow outdoors | Jun 16 – Jul 31 |
| Winter squash & pumpkins | Sow outdoors | Jun 30 – Jul 31 |
| Snap beans | Sow outdoors | Jun 16 – Jul 4 |
| Sweet corn | Sow outdoors | Jun 16 – Jun 1 |
| Watermelon & cantaloupe | Sow outdoors | Jun 30 – Jul 31 |
| Okra | Sow outdoors | Jun 23 – Jul 16 |
| Peas | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Potatoes | Plant outdoors (spring) | Apr 30 – Jun 30 |
| Onions | Start seeds indoors (spring) | Mar 19 – Apr 15 |
| Onions | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (spring) | Apr 12 – May 16 |
| Broccoli | Transplant outdoors (spring) | May 17 – Jun 15 |
| Broccoli | Start seeds indoors (fall) | May 22 – Jun 1 |
| Broccoli | Transplant outdoors (fall) | Jun 21 – Jul 2 |
| Cabbage | Start seeds indoors (spring) | Apr 2 – Apr 30 |
| Cabbage | Transplant outdoors (spring) | Apr 30 – May 31 |
| Cabbage | Start seeds indoors (fall) | May 12 – Jun 11 |
| Cabbage | Transplant outdoors (fall) | Jun 11 – Jul 12 |
| Leaf lettuce | Sow outdoors (spring) | Apr 30 – Jul 16 |
| Leaf lettuce | Sow outdoors (fall) | Jun 11 – Jul 28 |
| Spinach | Sow outdoors (spring) | Apr 23 – Jun 6 |
| Spinach | Sow outdoors (fall) | Jun 28 – Aug 2 |
| Radishes | Sow outdoors (spring) | Apr 30 – Jun 20 |
| Radishes | Sow outdoors (fall) | Jun 11 – Aug 12 |
| Kale | Sow outdoors (spring) | May 17 – Jun 6 |
| Kale | Sow outdoors (fall) | Jun 4 – Jul 12 |
| Carrots | Sow outdoors (spring) | May 31 – Jul 16 |
| Carrots | Sow outdoors (fall) | May 12 – Jun 27 |
| Garlic | Plant outdoors (fall) | Sep 11 – Oct 12 |
Where these dates come from
ZIP code 84749 is matched to the NOAA station Loa, UT, 4.8 km away, at 7,070 ft elevation (112 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Loa, UT (used) | 7,070 ft | May 31 | Sep 21 |
| Torrey 7 E, UT | 6,204 ft | Apr 22 | Oct 23 |
| Koosharem, UT | 6,930 ft | Jun 6 | Sep 21 |
| Capitol Reef Np, UT | 5,500 ft | Apr 18 | Oct 28 |
Frost dates near Lyman
- Loa, UT 84747 · last May 31, first Sep 21
- Bicknell, UT 84715 · last May 31, first Sep 21
- Teasdale, UT 84773 · last May 31, first Sep 21
- Torrey, UT 84775 · last May 31, first Sep 21
- Greenwich, UT 84732 · last Jun 6, first Sep 21
- Koosharem, UT 84744 · last Jun 6, first Sep 21
- Antimony, UT 84712 · last Jun 17, first Sep 12
- Glenwood, UT 84730 · last May 21, first Sep 24
Frequently asked questions
- When is the last frost in Lyman, UT?
- For ZIP code 84749, the average last spring frost (32°F) is May 31, based on NOAA 1991-2020 climate normals for the Loa, UT weather station. There is a 1-in-10 chance of a frost after June 14.
- When is the first frost in Lyman, UT?
- The average first fall frost (32°F) is September 21. There is a 1-in-10 chance of frost by September 8, so tender plants are at risk from that point on.
- How long is the growing season in 84749?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 112 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.