Frost Dates for Hesperia, CA
In Hesperia, CA, the average last spring frost is around Feb 28 and the average first fall frost around Dec 1, for a growing season of about 270 days. For frost-tender plants, wait until Apr 3, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Hesperia 2E, CA weather station, 3 miles away, elevation 3,055 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | Apr 3 | Nov 11 |
| 20% | Mar 22 | Nov 18 |
| 30% | Mar 12 | Nov 23 |
| 40% | Mar 5 | Nov 28 |
| 50% | Feb 28 | Dec 1 |
| 60% | Feb 24 | Dec 4 |
| 70% | Feb 17 | Dec 7 |
| 80% | Feb 11 | Dec 11 |
| 90% | Feb 1 | Dec 16 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | Mar 31 | Nov 16 |
| Frost / freeze (32°F) | Feb 28 | Dec 1 |
| Hard freeze (28°F) | Jan 30 | Dec 14 |
Planting calendar for Hesperia
Transplant Mar 7 – Mar 21
Transplant Mar 14 – Mar 28
Transplant Mar 14 – Mar 28
Transplant Mar 7 – Mar 21
Sow or transplant Mar 7 – Mar 21
Sow or transplant Mar 7 – Mar 21
Sow or transplant Mar 14 – Mar 28
Sow or transplant Jan 31 – Feb 14
Fall sowing Oct 6 – Nov 3
Fall sowing Oct 6 – Oct 27
Fall sowing Sep 22 – Oct 6
Sow or transplant Jan 31 – Feb 14
Fall sowing Sep 22 – Oct 20
Transplant Feb 14 – Feb 28
Fall sowing Sep 8 – Sep 22
Transplant Feb 7 – Feb 21
Fall sowing Sep 8 – Sep 22
Fall sowing Sep 8 – Sep 22
Fall sowing Oct 20 – Nov 10
Fall sowing Sep 22 – Oct 6
Plant Jan 31 – Feb 14
Based on the average last frost (Feb 28) and first frost (Dec 1). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.