Frost dates for 92310Fort Irwin, CA
The average last spring frost in Fort Irwin is February 22 and the average first fall frost is November 23, giving a typical growing season of about 271 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Feb 22
- Average first fall frost
- Nov 23
- Growing season
- 271 days
Safer after Mar 24 (1-in-10 risk)
Possible by Nov 9 (1-in-10 risk)
First frost typically in 27 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) | Feb 24 · Mar 17 · Apr 14 | Oct 31 · Nov 12 · Nov 26 | 237 days | 100% |
| Frost / freeze (32°F) | Jan 29 · Feb 22 · Mar 24 | Nov 9 · Nov 23 · Dec 8 | 271 days | 100% |
| Hard freeze (28°F) | Jan 2 · Jan 30 · Feb 25 | Nov 18 · Dec 6 · Dec 28 | 310 days | 99% |
Planting calendar for Fort Irwin
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 | Jan 22 – Mar 30 |
| Tomatoes | Transplant outdoors | Mar 10 – Aug 3 |
| Peppers | Start seeds indoors | Jan 22 – Feb 22 |
| Peppers | Transplant outdoors | Mar 24 – Apr 24 |
| Eggplant | Start seeds indoors | Feb 8 – Mar 9 |
| Eggplant | Transplant outdoors | Mar 24 – Apr 24 |
| Cucumbers | Sow outdoors | Mar 24 – Aug 13 |
| Summer squash | Sow outdoors | Mar 10 – Apr 24 |
| Winter squash & pumpkins | Sow outdoors | Mar 24 – Apr 24 |
| Snap beans | Sow outdoors | Mar 10 – Sep 5 |
| Sweet corn | Sow outdoors | Mar 10 – Aug 3 |
| Watermelon & cantaloupe | Sow outdoors | Mar 24 – Apr 24 |
| Okra | Sow outdoors | Mar 17 – Apr 9 |
| Peas | Sow outdoors (spring) | Jan 22 – Mar 9 |
| Potatoes | Plant outdoors (spring) | Jan 22 – Mar 24 |
| Onions | Start seeds indoors (spring) | Dec 11 – Jan 7 |
| Onions | Transplant outdoors (spring) | Feb 8 – Mar 9 |
| Broccoli | Start seeds indoors (spring) | Jan 4 – Feb 7 |
| Broccoli | Transplant outdoors (spring) | Feb 8 – Mar 9 |
| Broccoli | Start seeds indoors (fall) | Jul 24 – Aug 3 |
| Broccoli | Transplant outdoors (fall) | Aug 23 – Sep 3 |
| Cabbage | Start seeds indoors (spring) | Dec 25 – Jan 22 |
| Cabbage | Transplant outdoors (spring) | Jan 22 – Feb 22 |
| Cabbage | Start seeds indoors (fall) | Jul 14 – Aug 13 |
| Cabbage | Transplant outdoors (fall) | Aug 13 – Sep 13 |
| Leaf lettuce | Sow outdoors (spring) | Jan 22 – Apr 9 |
| Leaf lettuce | Sow outdoors (fall) | Aug 13 – Sep 29 |
| Spinach | Sow outdoors (spring) | Jan 15 – Feb 28 |
| Spinach | Sow outdoors (fall) | Aug 30 – Oct 4 |
| Radishes | Sow outdoors (spring) | Jan 22 – Mar 14 |
| Radishes | Sow outdoors (fall) | Aug 13 – Oct 14 |
| Kale | Sow outdoors (spring) | Feb 8 – Feb 28 |
| Kale | Sow outdoors (fall) | Aug 6 – Sep 13 |
| Carrots | Sow outdoors (spring) | Feb 22 – Apr 9 |
| Carrots | Sow outdoors (fall) | Jul 14 – Aug 29 |
| Garlic | Plant outdoors (fall) | Nov 13 – Dec 14 |
Where these dates come from
ZIP code 92310 is matched to the NOAA station Barstow, CA, 50.7 km away, at 2,220 ft elevation (342 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Barstow, CA (used) | 2,220 ft | Feb 22 | Nov 23 |
| Barstow Daggett Ap, CA | 1,917 ft | Feb 19 | Nov 26 |
| Baker, CA | 962 ft | Feb 14 | Nov 27 |
| Trona, CA | 1,695 ft | Feb 15 | Nov 28 |
Frost dates near Fort Irwin
- Yermo, CA 92398 · last Feb 19, first Nov 26
- Newberry Springs, CA 92365 · last Feb 19, first Nov 26
- Daggett, CA 92327 · last Feb 19, first Nov 26
- Barstow, CA 92312 · last Feb 22, first Nov 23
- Hinkley, CA 92347 · last Feb 22, first Nov 23
- Baker, CA 92309 · last Feb 14, first Nov 27
- Ludlow, CA 92338 · last Feb 19, first Nov 26
- Helendale, CA 92342 · last Feb 22, first Nov 23
Frequently asked questions
- When is the last frost in Fort Irwin, CA?
- For ZIP code 92310, the average last spring frost (32°F) is February 22, based on NOAA 1991-2020 climate normals for the Barstow, CA weather station. There is a 1-in-10 chance of a frost after March 24.
- When is the first frost in Fort Irwin, CA?
- The average first fall frost (32°F) is November 23. There is a 1-in-10 chance of frost by November 9, so tender plants are at risk from that point on.
- How long is the growing season in 92310?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 271 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.