Frost dates for 92397Wrightwood, CA
The average last spring frost in Wrightwood is May 16 and the average first fall frost is October 13, giving a typical growing season of about 151 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 16
- Average first fall frost
- Oct 13
- Growing season
- 151 days
Safer after Jun 9 (1-in-10 risk)
Possible by Sep 25 (1-in-10 risk)
Last frost typically in 194 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 14 · Jun 4 · Jun 20 | Sep 10 · Oct 1 · Oct 17 | 119 days | 100% |
| Frost / freeze (32°F) | Apr 25 · May 16 · Jun 9 | Sep 25 · Oct 13 · Nov 1 | 151 days | 100% |
| Hard freeze (28°F) | Apr 6 · Apr 25 · May 13 | Oct 10 · Oct 30 · Nov 13 | 186 days | 100% |
Planting calendar for Wrightwood
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 15 – Jun 21 |
| Tomatoes | Transplant outdoors | Jun 1 – Jun 23 |
| Peppers | Start seeds indoors | Apr 15 – May 16 |
| Peppers | Transplant outdoors | Jun 15 – Jul 16 |
| Eggplant | Start seeds indoors | May 2 – May 31 |
| Eggplant | Transplant outdoors | Jun 15 – Jul 16 |
| Cucumbers | Sow outdoors | Jun 15 – Jul 3 |
| Summer squash | Sow outdoors | Jun 1 – Jul 16 |
| Winter squash & pumpkins | Sow outdoors | Jun 15 – Jul 16 |
| Snap beans | Sow outdoors | Jun 1 – Jul 26 |
| Sweet corn | Sow outdoors | Jun 1 – Jun 23 |
| Watermelon & cantaloupe | Sow outdoors | Jun 15 – Jul 16 |
| Okra | Sow outdoors | Jun 8 – Jul 1 |
| Peas | Sow outdoors (spring) | Apr 15 – May 31 |
| Potatoes | Plant outdoors (spring) | Apr 15 – Jun 15 |
| Onions | Start seeds indoors (spring) | Mar 4 – Mar 31 |
| Onions | Transplant outdoors (spring) | May 2 – May 31 |
| Broccoli | Start seeds indoors (spring) | Mar 28 – May 1 |
| Broccoli | Transplant outdoors (spring) | May 2 – May 31 |
| Broccoli | Start seeds indoors (fall) | Jun 13 – Jun 23 |
| Broccoli | Transplant outdoors (fall) | Jul 13 – Jul 24 |
| Cabbage | Start seeds indoors (spring) | Mar 18 – Apr 15 |
| Cabbage | Transplant outdoors (spring) | Apr 15 – May 16 |
| Cabbage | Start seeds indoors (fall) | Jun 3 – Jul 3 |
| Cabbage | Transplant outdoors (fall) | Jul 3 – Aug 3 |
| Leaf lettuce | Sow outdoors (spring) | Apr 15 – Jul 1 |
| Leaf lettuce | Sow outdoors (fall) | Jul 3 – Aug 19 |
| Spinach | Sow outdoors (spring) | Apr 8 – May 22 |
| Spinach | Sow outdoors (fall) | Jul 20 – Aug 24 |
| Radishes | Sow outdoors (spring) | Apr 15 – Jun 5 |
| Radishes | Sow outdoors (fall) | Jul 3 – Sep 3 |
| Kale | Sow outdoors (spring) | May 2 – May 22 |
| Kale | Sow outdoors (fall) | Jun 26 – Aug 3 |
| Carrots | Sow outdoors (spring) | May 16 – Jul 1 |
| Carrots | Sow outdoors (fall) | Jun 3 – Jul 19 |
| Garlic | Plant outdoors (fall) | Oct 3 – Nov 3 |
Where these dates come from
ZIP code 92397 is matched to the NOAA station Wrightwood, CA, 1.3 km away, at 6,000 ft elevation (519 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Wrightwood, CA (used) | 6,000 ft | May 16 | Oct 13 |
| El Mirage, CA | 2,950 ft | Mar 21 | Nov 12 |
| Pearblossom, CA | 3,101 ft | Mar 13 | Dec 1 |
| Hesperia 2E, CA | 3,055 ft | Feb 28 | Dec 1 |
Frost dates near Wrightwood
- Phelan, CA 92329 · last Mar 13, first Dec 1
- Pinon Hills, CA 92372 · last Mar 13, first Dec 1
- Valyermo, CA 93563 · last May 16, first Oct 13
- Mount Baldy, CA 91759 · last Mar 13, first Dec 1
- Lytle Creek, CA 92358 · last May 5, first Nov 2
- Llano, CA 93544 · last Mar 13, first Dec 1
- Hesperia, CA 92344 · last Mar 18, first Nov 11
- Rancho Cucamonga, CA 91739 · last Jan 8, first Dec 28
Frequently asked questions
- When is the last frost in Wrightwood, CA?
- For ZIP code 92397, the average last spring frost (32°F) is May 16, based on NOAA 1991-2020 climate normals for the Wrightwood, CA weather station. There is a 1-in-10 chance of a frost after June 9.
- When is the first frost in Wrightwood, CA?
- The average first fall frost (32°F) is October 13. There is a 1-in-10 chance of frost by September 25, so tender plants are at risk from that point on.
- How long is the growing season in 92397?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 151 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.