Frost Dates for Chino Hills, CA
In Chino Hills, CA, the average last spring frost is around Jan 17 and the average first fall frost around Dec 19, for a growing season of about 335 days. For frost-tender plants, wait until Feb 22, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Chino Airport, CA weather station, 6 miles away, elevation 650 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 22 | Nov 27 |
| 20% | Feb 11 | Dec 5 |
| 30% | Feb 3 | Dec 10 |
| 40% | Jan 28 | Dec 14 |
| 50% | Jan 17 | Dec 19 |
| 60% | Jan 11 | Dec 23 |
| 70% | Jan 5 | Dec 28 |
| 80% | Dec 30 | Jan 2 |
| 90% | Dec 18 | Jan 17 |
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 24 | Dec 1 |
| Frost / freeze (32°F) | Jan 17 | Dec 19 |
| Hard freeze (28°F) | Jan 3 | Dec 30 |
Planting calendar for Chino Hills
Transplant Jan 24 – Feb 7
Transplant Jan 31 – Feb 14
Transplant Jan 31 – Feb 14
Transplant Jan 24 – Feb 7
Sow or transplant Jan 24 – Feb 7
Sow or transplant Jan 24 – Feb 7
Sow or transplant Jan 31 – Feb 14
Sow or transplant Dec 20 – Jan 3
Fall sowing Oct 24 – Nov 21
Fall sowing Oct 24 – Nov 14
Fall sowing Oct 10 – Oct 24
Sow or transplant Dec 20 – Jan 3
Fall sowing Oct 10 – Nov 7
Transplant Jan 3 – Jan 17
Fall sowing Sep 26 – Oct 10
Transplant Dec 27 – Jan 10
Fall sowing Sep 26 – Oct 10
Fall sowing Sep 26 – Oct 10
Fall sowing Nov 7 – Nov 28
Fall sowing Oct 10 – Oct 24
Plant Dec 20 – Jan 3
Based on the average last frost (Jan 17) and first frost (Dec 19). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.