Frost Dates for Vacaville, CA
In Vacaville, CA, the average last spring frost is around Feb 18 and the average first fall frost around Nov 28, for a growing season of about 283 days. For frost-tender plants, wait until Mar 25, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Vacaville Nut Tree Airport, CA weather station, 1 mile away, elevation 109 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% | Mar 25 | Nov 12 |
| 20% | Mar 10 | Nov 17 |
| 30% | Mar 3 | Nov 21 |
| 40% | Feb 26 | Nov 25 |
| 50% | Feb 18 | Nov 28 |
| 60% | Feb 10 | Dec 1 |
| 70% | Feb 1 | Dec 4 |
| 80% | Jan 25 | Dec 9 |
| 90% | Jan 11 | Dec 18 |
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 28 | Nov 13 |
| Frost / freeze (32°F) | Feb 18 | Nov 28 |
| Hard freeze (28°F) | Jan 15 | Dec 10 |
Planting calendar for Vacaville
Transplant Feb 25 – Mar 11
Transplant Mar 4 – Mar 18
Transplant Mar 4 – Mar 18
Transplant Feb 25 – Mar 11
Sow or transplant Feb 25 – Mar 11
Sow or transplant Feb 25 – Mar 11
Sow or transplant Mar 4 – Mar 18
Sow or transplant Jan 21 – Feb 4
Fall sowing Oct 3 – Oct 31
Fall sowing Oct 3 – Oct 24
Fall sowing Sep 19 – Oct 3
Sow or transplant Jan 21 – Feb 4
Fall sowing Sep 19 – Oct 17
Transplant Feb 4 – Feb 18
Fall sowing Sep 5 – Sep 19
Transplant Jan 28 – Feb 11
Fall sowing Sep 5 – Sep 19
Fall sowing Sep 5 – Sep 19
Fall sowing Oct 17 – Nov 7
Fall sowing Sep 19 – Oct 3
Plant Jan 21 – Feb 4
Based on the average last frost (Feb 18) and first frost (Nov 28). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.