Frost Dates for Brea, CA
In Brea, CA, the average last spring frost is around Jan 8 and the average first fall frost around Dec 28, for a growing season of about 354 days. For frost-tender plants, wait until Feb 18, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Pomona/Fairplex, CA weather station, 12 miles away, elevation 999 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 18 | Dec 5 |
| 20% | Feb 4 | Dec 13 |
| 30% | Jan 26 | Dec 19 |
| 40% | Jan 15 | Dec 24 |
| 50% | Jan 8 | Dec 28 |
| 60% | Jan 1 | Dec 31 |
| 70% | Dec 29 | Jan 4 |
| 80% | Dec 24 | Jan 14 |
| 90% | Dec 14 | Feb 2 |
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) | Feb 8 | Dec 10 |
| Frost / freeze (32°F) | Jan 8 | Dec 28 |
| Hard freeze (28°F) | — | — |
Planting calendar for Brea
Transplant Jan 15 – Jan 29
Transplant Jan 22 – Feb 5
Transplant Jan 22 – Feb 5
Transplant Jan 15 – Jan 29
Sow or transplant Jan 15 – Jan 29
Sow or transplant Jan 15 – Jan 29
Sow or transplant Jan 22 – Feb 5
Sow or transplant Dec 11 – Dec 25
Fall sowing Nov 2 – Nov 30
Fall sowing Nov 2 – Nov 23
Fall sowing Oct 19 – Nov 2
Sow or transplant Dec 11 – Dec 25
Fall sowing Oct 19 – Nov 16
Transplant Dec 25 – Jan 8
Fall sowing Oct 5 – Oct 19
Transplant Dec 18 – Jan 1
Fall sowing Oct 5 – Oct 19
Fall sowing Oct 5 – Oct 19
Fall sowing Nov 16 – Dec 7
Fall sowing Oct 19 – Nov 2
Plant Dec 11 – Dec 25
Based on the average last frost (Jan 8) and first frost (Dec 28). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.