Frost dates for 92340Hesperia, CA
The average last spring frost in Hesperia is February 28 and the average first fall frost is December 1, giving a typical growing season of about 270 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Feb 28
- Average first fall frost
- Dec 1
- Growing season
- 270 days
Safer after Apr 3 (1-in-10 risk)
Possible by Nov 11 (1-in-10 risk)
First frost typically in 35 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 3 · Mar 31 · Apr 22 | Oct 29 · Nov 16 · Dec 1 | 229 days | 100% |
| Frost / freeze (32°F) | Feb 1 · Feb 28 · Apr 3 | Nov 11 · Dec 1 · Dec 16 | 270 days | 100% |
| Hard freeze (28°F) | Dec 31 · Jan 30 · Mar 1 | Nov 26 · Dec 14 · Jan 10 | 318 days | 97% |
Planting calendar for Hesperia
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 28 – Apr 5 |
| Tomatoes | Transplant outdoors | Mar 16 – Aug 11 |
| Peppers | Start seeds indoors | Jan 28 – Feb 28 |
| Peppers | Transplant outdoors | Mar 30 – Apr 30 |
| Eggplant | Start seeds indoors | Feb 14 – Mar 15 |
| Eggplant | Transplant outdoors | Mar 30 – Apr 30 |
| Cucumbers | Sow outdoors | Mar 30 – Aug 21 |
| Summer squash | Sow outdoors | Mar 16 – Apr 30 |
| Winter squash & pumpkins | Sow outdoors | Mar 30 – Apr 30 |
| Snap beans | Sow outdoors | Mar 16 – Sep 13 |
| Sweet corn | Sow outdoors | Mar 16 – Aug 11 |
| Watermelon & cantaloupe | Sow outdoors | Mar 30 – Apr 30 |
| Okra | Sow outdoors | Mar 23 – Apr 15 |
| Peas | Sow outdoors (spring) | Jan 28 – Mar 15 |
| Potatoes | Plant outdoors (spring) | Jan 28 – Mar 30 |
| Onions | Start seeds indoors (spring) | Dec 17 – Jan 13 |
| Onions | Transplant outdoors (spring) | Feb 14 – Mar 15 |
| Broccoli | Start seeds indoors (spring) | Jan 10 – Feb 13 |
| Broccoli | Transplant outdoors (spring) | Feb 14 – Mar 15 |
| Broccoli | Start seeds indoors (fall) | Aug 1 – Aug 11 |
| Broccoli | Transplant outdoors (fall) | Aug 31 – Sep 11 |
| Cabbage | Start seeds indoors (spring) | Dec 31 – Jan 28 |
| Cabbage | Transplant outdoors (spring) | Jan 28 – Feb 28 |
| Cabbage | Start seeds indoors (fall) | Jul 22 – Aug 21 |
| Cabbage | Transplant outdoors (fall) | Aug 21 – Sep 21 |
| Leaf lettuce | Sow outdoors (spring) | Jan 28 – Apr 15 |
| Leaf lettuce | Sow outdoors (fall) | Aug 21 – Oct 7 |
| Spinach | Sow outdoors (spring) | Jan 21 – Mar 6 |
| Spinach | Sow outdoors (fall) | Sep 7 – Oct 12 |
| Radishes | Sow outdoors (spring) | Jan 28 – Mar 20 |
| Radishes | Sow outdoors (fall) | Aug 21 – Oct 22 |
| Kale | Sow outdoors (spring) | Feb 14 – Mar 6 |
| Kale | Sow outdoors (fall) | Aug 14 – Sep 21 |
| Carrots | Sow outdoors (spring) | Feb 28 – Apr 15 |
| Carrots | Sow outdoors (fall) | Jul 22 – Sep 6 |
| Garlic | Plant outdoors (fall) | Nov 21 – Dec 22 |
Where these dates come from
ZIP code 92340 is matched to the NOAA station Hesperia 2E, CA, 3.3 km away, at 3,055 ft elevation (121 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hesperia 2E, CA (used) | 3,055 ft | Feb 28 | Dec 1 |
| Victorville, CA | 2,880 ft | Mar 18 | Nov 11 |
| Lake Arrowhead, CA | 5,205 ft | May 5 | Nov 2 |
| Wrightwood, CA | 6,000 ft | May 16 | Oct 13 |
Frost dates near Hesperia
- Hesperia, CA 92345 · last Feb 28, first Dec 1
- Victorville, CA 92395 · last Mar 18, first Nov 11
- Apple Valley, CA 92308 · last Mar 18, first Nov 11
- Cedarpines Park, CA 92322 · last May 5, first Nov 2
- Phelan, CA 92371 · last Mar 18, first Nov 11
- Crestline, CA 92325 · last May 5, first Nov 2
- Lake Arrowhead, CA 92352 · last May 5, first Nov 2
- Adelanto, CA 92301 · last Mar 18, first Nov 11
Frequently asked questions
- When is the last frost in Hesperia, CA?
- For ZIP code 92340, the average last spring frost (32°F) is February 28, based on NOAA 1991-2020 climate normals for the Hesperia 2E, CA weather station. There is a 1-in-10 chance of a frost after April 3.
- When is the first frost in Hesperia, CA?
- The average first fall frost (32°F) is December 1. There is a 1-in-10 chance of frost by November 11, so tender plants are at risk from that point on.
- How long is the growing season in 92340?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 270 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.