Frost dates for 84730Glenwood, UT
The average last spring frost in Glenwood is May 21 and the average first fall frost is September 24, giving a typical growing season of about 125 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 21
- Average first fall frost
- Sep 24
- Growing season
- 125 days
Safer after Jun 7 (1-in-10 risk)
Possible by Sep 12 (1-in-10 risk)
Last frost typically in 204 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 20 · Jun 5 · Jun 25 | Sep 3 · Sep 16 · Sep 28 | 100 days | 100% |
| Frost / freeze (32°F) | May 4 · May 21 · Jun 7 | Sep 12 · Sep 24 · Oct 6 | 125 days | 100% |
| Hard freeze (28°F) | Apr 23 · May 7 · May 22 | Sep 22 · Oct 4 · Oct 18 | 149 days | 100% |
Planting calendar for Glenwood
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 20 – Jun 26 |
| Tomatoes | Transplant outdoors | Jun 6 – Jun 4 |
| Peppers | Start seeds indoors | Apr 20 – May 21 |
| Peppers | Transplant outdoors | Jun 20 – Jul 21 |
| Eggplant | Start seeds indoors | May 7 – Jun 5 |
| Eggplant | Transplant outdoors | Jun 20 – Jul 21 |
| Cucumbers | Sow outdoors | Jun 20 – Jun 14 |
| Summer squash | Sow outdoors | Jun 6 – Jul 21 |
| Winter squash & pumpkins | Sow outdoors | Jun 20 – Jul 21 |
| Snap beans | Sow outdoors | Jun 6 – Jul 7 |
| Sweet corn | Sow outdoors | Jun 6 – Jun 4 |
| Watermelon & cantaloupe | Sow outdoors | Jun 20 – Jul 21 |
| Okra | Sow outdoors | Jun 13 – Jul 6 |
| Peas | Sow outdoors (spring) | Apr 20 – Jun 5 |
| Potatoes | Plant outdoors (spring) | Apr 20 – Jun 20 |
| Onions | Start seeds indoors (spring) | Mar 9 – Apr 5 |
| Onions | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (spring) | Apr 2 – May 6 |
| Broccoli | Transplant outdoors (spring) | May 7 – Jun 5 |
| Broccoli | Start seeds indoors (fall) | May 25 – Jun 4 |
| Broccoli | Transplant outdoors (fall) | Jun 24 – Jul 5 |
| Cabbage | Start seeds indoors (spring) | Mar 23 – Apr 20 |
| Cabbage | Transplant outdoors (spring) | Apr 20 – May 21 |
| Cabbage | Start seeds indoors (fall) | May 15 – Jun 14 |
| Cabbage | Transplant outdoors (fall) | Jun 14 – Jul 15 |
| Leaf lettuce | Sow outdoors (spring) | Apr 20 – Jul 6 |
| Leaf lettuce | Sow outdoors (fall) | Jun 14 – Jul 31 |
| Spinach | Sow outdoors (spring) | Apr 13 – May 27 |
| Spinach | Sow outdoors (fall) | Jul 1 – Aug 5 |
| Radishes | Sow outdoors (spring) | Apr 20 – Jun 10 |
| Radishes | Sow outdoors (fall) | Jun 14 – Aug 15 |
| Kale | Sow outdoors (spring) | May 7 – May 27 |
| Kale | Sow outdoors (fall) | Jun 7 – Jul 15 |
| Carrots | Sow outdoors (spring) | May 21 – Jul 6 |
| Carrots | Sow outdoors (fall) | May 15 – Jun 30 |
| Garlic | Plant outdoors (fall) | Sep 14 – Oct 15 |
Where these dates come from
ZIP code 84730 is matched to the NOAA station Richfield Radio Ksvc, UT, 7.6 km away, at 5,285 ft elevation (3 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Richfield Radio Ksvc, UT (used) | 5,285 ft | May 21 | Sep 24 |
| Koosharem, UT | 6,930 ft | Jun 6 | Sep 21 |
| Fillmore, UT | 5,127 ft | May 4 | Oct 14 |
| Fremont Indian Sp, UT | 5,920 ft | Jun 4 | Sep 21 |
Frost dates near Glenwood
- Richfield, UT 84701 · last May 21, first Sep 24
- Annabella, UT 84711 · last May 21, first Sep 24
- Sigurd, UT 84657 · last May 21, first Sep 24
- Monroe, UT 84754 · last May 21, first Sep 24
- Elsinore, UT 84724 · last May 21, first Sep 24
- Aurora, UT 84620 · last May 21, first Sep 24
- Salina, UT 84654 · last May 21, first Sep 24
- Joseph, UT 84739 · last Jun 4, first Sep 21
Frequently asked questions
- When is the last frost in Glenwood, UT?
- For ZIP code 84730, the average last spring frost (32°F) is May 21, based on NOAA 1991-2020 climate normals for the Richfield Radio Ksvc, UT weather station. There is a 1-in-10 chance of a frost after June 7.
- When is the first frost in Glenwood, UT?
- The average first fall frost (32°F) is September 24. There is a 1-in-10 chance of frost by September 12, so tender plants are at risk from that point on.
- How long is the growing season in 84730?
- 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.