Frost dates for 84515Cisco, UT
The average last spring frost in Cisco is April 27 and the average first fall frost is October 9, giving a typical growing season of about 165 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 27
- Average first fall frost
- Oct 9
- Growing season
- 165 days
Safer after May 9 (1-in-10 risk)
Possible by Sep 28 (1-in-10 risk)
Last frost typically in 183 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) | Apr 24 · May 7 · May 22 | Sep 19 · Oct 2 · Oct 13 | 147 days | 100% |
| Frost / freeze (32°F) | Apr 13 · Apr 27 · May 9 | Sep 28 · Oct 9 · Oct 20 | 165 days | 100% |
| Hard freeze (28°F) | Mar 29 · Apr 14 · Apr 30 | Oct 5 · Oct 18 · Oct 31 | 185 days | 100% |
Planting calendar for Cisco
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 | Mar 27 – Jun 2 |
| Tomatoes | Transplant outdoors | May 13 – Jun 19 |
| Peppers | Start seeds indoors | Mar 27 – Apr 27 |
| Peppers | Transplant outdoors | May 27 – Jun 27 |
| Eggplant | Start seeds indoors | Apr 13 – May 12 |
| Eggplant | Transplant outdoors | May 27 – Jun 27 |
| Cucumbers | Sow outdoors | May 27 – Jun 29 |
| Summer squash | Sow outdoors | May 13 – Jun 27 |
| Winter squash & pumpkins | Sow outdoors | May 27 – Jun 27 |
| Snap beans | Sow outdoors | May 13 – Jul 22 |
| Sweet corn | Sow outdoors | May 13 – Jun 19 |
| Watermelon & cantaloupe | Sow outdoors | May 27 – Jun 27 |
| Okra | Sow outdoors | May 20 – Jun 12 |
| Peas | Sow outdoors (spring) | Mar 27 – May 12 |
| Potatoes | Plant outdoors (spring) | Mar 27 – May 27 |
| Onions | Start seeds indoors (spring) | Feb 13 – Mar 12 |
| Onions | Transplant outdoors (spring) | Apr 13 – May 12 |
| Broccoli | Start seeds indoors (spring) | Mar 9 – Apr 12 |
| Broccoli | Transplant outdoors (spring) | Apr 13 – May 12 |
| Broccoli | Start seeds indoors (fall) | Jun 9 – Jun 19 |
| Broccoli | Transplant outdoors (fall) | Jul 9 – Jul 20 |
| Cabbage | Start seeds indoors (spring) | Feb 27 – Mar 27 |
| Cabbage | Transplant outdoors (spring) | Mar 27 – Apr 27 |
| Cabbage | Start seeds indoors (fall) | May 30 – Jun 29 |
| Cabbage | Transplant outdoors (fall) | Jun 29 – Jul 30 |
| Leaf lettuce | Sow outdoors (spring) | Mar 27 – Jun 12 |
| Leaf lettuce | Sow outdoors (fall) | Jun 29 – Aug 15 |
| Spinach | Sow outdoors (spring) | Mar 20 – May 3 |
| Spinach | Sow outdoors (fall) | Jul 16 – Aug 20 |
| Radishes | Sow outdoors (spring) | Mar 27 – May 17 |
| Radishes | Sow outdoors (fall) | Jun 29 – Aug 30 |
| Kale | Sow outdoors (spring) | Apr 13 – May 3 |
| Kale | Sow outdoors (fall) | Jun 22 – Jul 30 |
| Carrots | Sow outdoors (spring) | Apr 27 – Jun 12 |
| Carrots | Sow outdoors (fall) | May 30 – Jul 15 |
| Garlic | Plant outdoors (fall) | Sep 29 – Oct 30 |
Where these dates come from
ZIP code 84515 is matched to the NOAA station Dewey, UT, 17.6 km away, at 4,120 ft elevation (240 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Dewey, UT (used) | 4,120 ft | Apr 27 | Oct 9 |
| Glade Park 17W, CO | 6,323 ft | May 21 | Sep 26 |
| Castle Valley, UT | 4,725 ft | Apr 17 | Oct 23 |
| Castle Valley 1Se, UT | 4,905 ft | Apr 19 | Oct 21 |
Frost dates near Cisco
- Thompson, UT 84540 · last Apr 22, first Oct 20
- Gateway, CO 81522 · last Apr 20, first Oct 21
- Mack, CO 81525 · last Apr 27, first Oct 11
- Glade Park, CO 81523 · last May 21, first Sep 26
- Moab, UT 84532 · last Apr 11, first Oct 23
- Loma, CO 81524 · last Apr 27, first Oct 11
- Fruita, CO 81521 · last Apr 27, first Oct 11
- Grand Junction, CO 81507 · last Apr 26, first Oct 16
Frequently asked questions
- When is the last frost in Cisco, UT?
- For ZIP code 84515, the average last spring frost (32°F) is April 27, based on NOAA 1991-2020 climate normals for the Dewey, UT weather station. There is a 1-in-10 chance of a frost after May 9.
- When is the first frost in Cisco, UT?
- The average first fall frost (32°F) is October 9. There is a 1-in-10 chance of frost by September 28, so tender plants are at risk from that point on.
- How long is the growing season in 84515?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 165 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.