Frost dates for 86437Valentine, AZ
The average last spring frost in Valentine is May 17 and the average first fall frost is October 10, giving a typical growing season of about 146 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 17
- Average first fall frost
- Oct 10
- Growing season
- 146 days
Safer after Jun 4 (1-in-10 risk)
Possible by Sep 28 (1-in-10 risk)
Last frost typically in 202 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 2 · Jun 16 | Sep 20 · Oct 1 · Oct 15 | 121 days | 100% |
| Frost / freeze (32°F) | May 1 · May 17 · Jun 4 | Sep 28 · Oct 10 · Oct 26 | 146 days | 100% |
| Hard freeze (28°F) | Apr 11 · Apr 30 · May 17 | Oct 8 · Oct 23 · Nov 8 | 177 days | 100% |
Planting calendar for Valentine
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 16 – Jun 22 |
| Tomatoes | Transplant outdoors | Jun 2 – Jun 20 |
| Peppers | Start seeds indoors | Apr 16 – May 17 |
| Peppers | Transplant outdoors | Jun 16 – Jul 17 |
| Eggplant | Start seeds indoors | May 3 – Jun 1 |
| Eggplant | Transplant outdoors | Jun 16 – Jul 17 |
| Cucumbers | Sow outdoors | Jun 16 – Jun 30 |
| Summer squash | Sow outdoors | Jun 2 – Jul 17 |
| Winter squash & pumpkins | Sow outdoors | Jun 16 – Jul 17 |
| Snap beans | Sow outdoors | Jun 2 – Jul 23 |
| Sweet corn | Sow outdoors | Jun 2 – Jun 20 |
| Watermelon & cantaloupe | Sow outdoors | Jun 16 – Jul 17 |
| Okra | Sow outdoors | Jun 9 – Jul 2 |
| Peas | Sow outdoors (spring) | Apr 16 – Jun 1 |
| Potatoes | Plant outdoors (spring) | Apr 16 – Jun 16 |
| Onions | Start seeds indoors (spring) | Mar 5 – Apr 1 |
| Onions | Transplant outdoors (spring) | May 3 – Jun 1 |
| Broccoli | Start seeds indoors (spring) | Mar 29 – May 2 |
| Broccoli | Transplant outdoors (spring) | May 3 – Jun 1 |
| Broccoli | Start seeds indoors (fall) | Jun 10 – Jun 20 |
| Broccoli | Transplant outdoors (fall) | Jul 10 – Jul 21 |
| Cabbage | Start seeds indoors (spring) | Mar 19 – Apr 16 |
| Cabbage | Transplant outdoors (spring) | Apr 16 – May 17 |
| Cabbage | Start seeds indoors (fall) | May 31 – Jun 30 |
| Cabbage | Transplant outdoors (fall) | Jun 30 – Jul 31 |
| Leaf lettuce | Sow outdoors (spring) | Apr 16 – Jul 2 |
| Leaf lettuce | Sow outdoors (fall) | Jun 30 – Aug 16 |
| Spinach | Sow outdoors (spring) | Apr 9 – May 23 |
| Spinach | Sow outdoors (fall) | Jul 17 – Aug 21 |
| Radishes | Sow outdoors (spring) | Apr 16 – Jun 6 |
| Radishes | Sow outdoors (fall) | Jun 30 – Aug 31 |
| Kale | Sow outdoors (spring) | May 3 – May 23 |
| Kale | Sow outdoors (fall) | Jun 23 – Jul 31 |
| Carrots | Sow outdoors (spring) | May 17 – Jul 2 |
| Carrots | Sow outdoors (fall) | May 31 – Jul 16 |
| Garlic | Plant outdoors (fall) | Sep 30 – Oct 31 |
Where these dates come from
ZIP code 86437 is matched to the NOAA station Diamond M Rch, AZ, 24.3 km away, at 5,492 ft elevation (797 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Diamond M Rch, AZ (used) | 5,492 ft | May 17 | Oct 10 |
| Kingman Mohave Co Ap, AZ | 3,420 ft | Apr 2 | Nov 11 |
| Seligman, AZ | 5,250 ft | May 10 | Oct 15 |
| Yucca 1 Nne, AZ | 1,950 ft | Feb 18 | Dec 2 |
Frost dates near Valentine
- Hackberry, AZ 86411 · last Apr 2, first Nov 11
- Hualapai, AZ 86412 · last Apr 2, first Nov 11
- Peach Springs, AZ 86434 · last May 17, first Oct 10
- Kingman, AZ 86401 · last Apr 2, first Nov 11
- Temple Bar Marina, AZ 86443 · last Apr 2, first Nov 11
- Chloride, AZ 86431 · last Apr 2, first Nov 11
- Golden Valley, AZ 86413 · last Apr 2, first Nov 11
- Seligman, AZ 86337 · last May 10, first Oct 15
Frequently asked questions
- When is the last frost in Valentine, AZ?
- For ZIP code 86437, the average last spring frost (32°F) is May 17, based on NOAA 1991-2020 climate normals for the Diamond M Rch, AZ weather station. There is a 1-in-10 chance of a frost after June 4.
- When is the first frost in Valentine, AZ?
- The average first fall frost (32°F) is October 10. 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 86437?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 146 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.