Frost dates for 84531Mexican Hat, UT
The average last spring frost in Mexican Hat is March 29 and the average first fall frost is November 6, giving a typical growing season of about 223 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 29
- Average first fall frost
- Nov 6
- Growing season
- 223 days
Safer after Apr 15 (1-in-10 risk)
Possible by Oct 23 (1-in-10 risk)
First frost typically in 10 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) | Mar 29 · Apr 14 · May 2 | Oct 13 · Oct 28 · Nov 10 | 195 days | 100% |
| Frost / freeze (32°F) | Mar 8 · Mar 29 · Apr 15 | Oct 23 · Nov 6 · Nov 19 | 223 days | 100% |
| Hard freeze (28°F) | Feb 19 · Mar 8 · Mar 31 | Nov 3 · Nov 17 · Nov 30 | 250 days | 100% |
Planting calendar for Mexican Hat
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 | Feb 26 – May 4 |
| Tomatoes | Transplant outdoors | Apr 14 – Jul 17 |
| Peppers | Start seeds indoors | Feb 26 – Mar 29 |
| Peppers | Transplant outdoors | Apr 28 – May 29 |
| Eggplant | Start seeds indoors | Mar 15 – Apr 13 |
| Eggplant | Transplant outdoors | Apr 28 – May 29 |
| Cucumbers | Sow outdoors | Apr 28 – Jul 27 |
| Summer squash | Sow outdoors | Apr 14 – May 29 |
| Winter squash & pumpkins | Sow outdoors | Apr 28 – May 29 |
| Snap beans | Sow outdoors | Apr 14 – Aug 19 |
| Sweet corn | Sow outdoors | Apr 14 – Jul 17 |
| Watermelon & cantaloupe | Sow outdoors | Apr 28 – May 29 |
| Okra | Sow outdoors | Apr 21 – May 14 |
| Peas | Sow outdoors (spring) | Feb 26 – Apr 13 |
| Potatoes | Plant outdoors (spring) | Feb 26 – Apr 28 |
| Onions | Start seeds indoors (spring) | Jan 15 – Feb 11 |
| Onions | Transplant outdoors (spring) | Mar 15 – Apr 13 |
| Broccoli | Start seeds indoors (spring) | Feb 8 – Mar 14 |
| Broccoli | Transplant outdoors (spring) | Mar 15 – Apr 13 |
| Broccoli | Start seeds indoors (fall) | Jul 7 – Jul 17 |
| Broccoli | Transplant outdoors (fall) | Aug 6 – Aug 17 |
| Cabbage | Start seeds indoors (spring) | Jan 29 – Feb 26 |
| Cabbage | Transplant outdoors (spring) | Feb 26 – Mar 29 |
| Cabbage | Start seeds indoors (fall) | Jun 27 – Jul 27 |
| Cabbage | Transplant outdoors (fall) | Jul 27 – Aug 27 |
| Leaf lettuce | Sow outdoors (spring) | Feb 26 – May 14 |
| Leaf lettuce | Sow outdoors (fall) | Jul 27 – Sep 12 |
| Spinach | Sow outdoors (spring) | Feb 19 – Apr 4 |
| Spinach | Sow outdoors (fall) | Aug 13 – Sep 17 |
| Radishes | Sow outdoors (spring) | Feb 26 – Apr 18 |
| Radishes | Sow outdoors (fall) | Jul 27 – Sep 27 |
| Kale | Sow outdoors (spring) | Mar 15 – Apr 4 |
| Kale | Sow outdoors (fall) | Jul 20 – Aug 27 |
| Carrots | Sow outdoors (spring) | Mar 29 – May 14 |
| Carrots | Sow outdoors (fall) | Jun 27 – Aug 12 |
| Garlic | Plant outdoors (fall) | Oct 27 – Nov 27 |
Where these dates come from
ZIP code 84531 is matched to the NOAA station Valley Of The Gods, UT, 17.6 km away, at 5,287 ft elevation (18 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Valley Of The Gods, UT (used) | 5,287 ft | Mar 29 | Nov 6 |
| Mexican Hat, UT | 4,109 ft | Apr 11 | Oct 30 |
| Monument Valley, AZ | 5,501 ft | Apr 10 | Nov 1 |
| Bluff, UT | 4,319 ft | Apr 24 | Oct 13 |
Frost dates near Mexican Hat
- Monument Valley, UT 84536 · last Apr 10, first Nov 1
- Dennehotso, AZ 86535 · last Apr 10, first Nov 1
- Bluff, UT 84512 · last Apr 24, first Oct 13
- Kayenta, AZ 86033 · last Apr 10, first Nov 1
- Rock Point, AZ 86545 · last Apr 11, first Nov 1
- Teec Nos Pos, AZ 86514 · last Apr 11, first Nov 1
- Blanding, UT 84511 · last Apr 28, first Oct 21
- Aneth, UT 84510 · last Apr 24, first Oct 13
Frequently asked questions
- When is the last frost in Mexican Hat, UT?
- For ZIP code 84531, the average last spring frost (32°F) is March 29, based on NOAA 1991-2020 climate normals for the Valley Of The Gods, UT weather station. There is a 1-in-10 chance of a frost after April 15.
- When is the first frost in Mexican Hat, UT?
- The average first fall frost (32°F) is November 6. There is a 1-in-10 chance of frost by October 23, so tender plants are at risk from that point on.
- How long is the growing season in 84531?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 223 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.