Frost dates for 84026Fort Duchesne, UT
The average last spring frost in Fort Duchesne is May 19 and the average first fall frost is October 2, giving a typical growing season of about 135 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 19
- Average first fall frost
- Oct 2
- Growing season
- 135 days
Safer after Jun 15 (1-in-10 risk)
Possible by Sep 19 (1-in-10 risk)
Last frost typically in 205 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 16 · Jun 3 · Jul 3 | Sep 6 · Sep 22 · Oct 4 | 110 days | 100% |
| Frost / freeze (32°F) | May 1 · May 19 · Jun 15 | Sep 19 · Oct 2 · Oct 16 | 135 days | 100% |
| Hard freeze (28°F) | Apr 18 · May 3 · May 31 | Sep 27 · Oct 12 · Oct 27 | 161 days | 100% |
Planting calendar for Fort Duchesne
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 18 – Jun 24 |
| Tomatoes | Transplant outdoors | Jun 4 – Jun 12 |
| Peppers | Start seeds indoors | Apr 18 – May 19 |
| Peppers | Transplant outdoors | Jun 18 – Jul 19 |
| Eggplant | Start seeds indoors | May 5 – Jun 3 |
| Eggplant | Transplant outdoors | Jun 18 – Jul 19 |
| Cucumbers | Sow outdoors | Jun 18 – Jun 22 |
| Summer squash | Sow outdoors | Jun 4 – Jul 19 |
| Winter squash & pumpkins | Sow outdoors | Jun 18 – Jul 19 |
| Snap beans | Sow outdoors | Jun 4 – Jul 15 |
| Sweet corn | Sow outdoors | Jun 4 – Jun 12 |
| Watermelon & cantaloupe | Sow outdoors | Jun 18 – Jul 19 |
| Okra | Sow outdoors | Jun 11 – Jul 4 |
| Peas | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Potatoes | Plant outdoors (spring) | Apr 18 – Jun 18 |
| Onions | Start seeds indoors (spring) | Mar 7 – Apr 3 |
| Onions | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (spring) | Mar 31 – May 4 |
| Broccoli | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (fall) | Jun 2 – Jun 12 |
| Broccoli | Transplant outdoors (fall) | Jul 2 – Jul 13 |
| Cabbage | Start seeds indoors (spring) | Mar 21 – Apr 18 |
| Cabbage | Transplant outdoors (spring) | Apr 18 – May 19 |
| Cabbage | Start seeds indoors (fall) | May 23 – Jun 22 |
| Cabbage | Transplant outdoors (fall) | Jun 22 – Jul 23 |
| Leaf lettuce | Sow outdoors (spring) | Apr 18 – Jul 4 |
| Leaf lettuce | Sow outdoors (fall) | Jun 22 – Aug 8 |
| Spinach | Sow outdoors (spring) | Apr 11 – May 25 |
| Spinach | Sow outdoors (fall) | Jul 9 – Aug 13 |
| Radishes | Sow outdoors (spring) | Apr 18 – Jun 8 |
| Radishes | Sow outdoors (fall) | Jun 22 – Aug 23 |
| Kale | Sow outdoors (spring) | May 5 – May 25 |
| Kale | Sow outdoors (fall) | Jun 15 – Jul 23 |
| Carrots | Sow outdoors (spring) | May 19 – Jul 4 |
| Carrots | Sow outdoors (fall) | May 23 – Jul 8 |
| Garlic | Plant outdoors (fall) | Sep 22 – Oct 23 |
Where these dates come from
ZIP code 84026 is matched to the NOAA station Ft Duchesne, UT, 1.9 km away, at 5,052 ft elevation (3 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Ft Duchesne, UT (used) | 5,052 ft | May 19 | Oct 2 |
| Roosevelt Radio, UT | 5,014 ft | May 23 | Sep 22 |
| Neola, UT | 5,950 ft | May 19 | Sep 29 |
| Myton, UT | 5,085 ft | May 7 | Oct 5 |
Frost dates near Fort Duchesne
- Lapoint, UT 84039 · last May 7, first Oct 6
- Roosevelt, UT 84066 · last May 23, first Sep 22
- Randlett, UT 84063 · last May 2, first Oct 3
- Tridell, UT 84076 · last May 19, first Sep 29
- Whiterocks, UT 84085 · last May 19, first Sep 29
- Myton, UT 84052 · last May 7, first Oct 5
- Neola, UT 84053 · last May 19, first Sep 29
- Bluebell, UT 84007 · last May 31, first Sep 23
Frequently asked questions
- When is the last frost in Fort Duchesne, UT?
- For ZIP code 84026, the average last spring frost (32°F) is May 19, based on NOAA 1991-2020 climate normals for the Ft Duchesne, UT weather station. There is a 1-in-10 chance of a frost after June 15.
- When is the first frost in Fort Duchesne, UT?
- The average first fall frost (32°F) is October 2. There is a 1-in-10 chance of frost by September 19, so tender plants are at risk from that point on.
- How long is the growing season in 84026?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 135 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.