Frost Dates for Banning, CA
In Banning, CA, the average last spring frost is around Jan 31 and the average first fall frost around Dec 10, for a growing season of about 315 days. For frost-tender plants, wait until Feb 28, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the San Jacinto, CA weather station, 11 miles away, elevation 1,525 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% | Feb 28 | Nov 22 |
| 20% | Feb 21 | Nov 29 |
| 30% | Feb 14 | Dec 2 |
| 40% | Feb 6 | Dec 6 |
| 50% | Jan 31 | Dec 10 |
| 60% | Jan 25 | Dec 14 |
| 70% | Jan 17 | Dec 18 |
| 80% | Jan 6 | Dec 26 |
| 90% | Dec 31 | Jan 6 |
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 5 | Nov 24 |
| Frost / freeze (32°F) | Jan 31 | Dec 10 |
| Hard freeze (28°F) | Jan 3 | Dec 21 |
Planting calendar for Banning
Transplant Feb 7 – Feb 21
Transplant Feb 14 – Feb 28
Transplant Feb 14 – Feb 28
Transplant Feb 7 – Feb 21
Sow or transplant Feb 7 – Feb 21
Sow or transplant Feb 7 – Feb 21
Sow or transplant Feb 14 – Feb 28
Sow or transplant Jan 3 – Jan 17
Fall sowing Oct 15 – Nov 12
Fall sowing Oct 15 – Nov 5
Fall sowing Oct 1 – Oct 15
Sow or transplant Jan 3 – Jan 17
Fall sowing Oct 1 – Oct 29
Transplant Jan 17 – Jan 31
Fall sowing Sep 17 – Oct 1
Transplant Jan 10 – Jan 24
Fall sowing Sep 17 – Oct 1
Fall sowing Sep 17 – Oct 1
Fall sowing Oct 29 – Nov 19
Fall sowing Oct 1 – Oct 15
Plant Jan 3 – Jan 17
Based on the average last frost (Jan 31) and first frost (Dec 10). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.