Frost Dates for Martinez, CA
In Martinez, CA, the average last spring frost is around Feb 28 and the average first fall frost around Nov 22, for a growing season of about 266 days. For frost-tender plants, wait until Apr 5, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Martinez Wtp, CA weather station, 1 mile away, elevation 40 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 5 | Nov 7 |
| 20% | Mar 22 | Nov 12 |
| 30% | Mar 11 | Nov 15 |
| 40% | Mar 5 | Nov 19 |
| 50% | Feb 28 | Nov 22 |
| 60% | Feb 24 | Nov 25 |
| 70% | Feb 17 | Nov 29 |
| 80% | Feb 9 | Dec 3 |
| 90% | Jan 29 | Dec 10 |
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) | Apr 10 | Nov 7 |
| Frost / freeze (32°F) | Feb 28 | Nov 22 |
| Hard freeze (28°F) | Jan 23 | Dec 9 |
Planting calendar for Martinez
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 Sep 27 – Oct 25
Fall sowing Sep 27 – Oct 18
Fall sowing Sep 13 – Sep 27
Sow or transplant Jan 31 – Feb 14
Fall sowing Sep 13 – Oct 11
Transplant Feb 14 – Feb 28
Fall sowing Aug 30 – Sep 13
Transplant Feb 7 – Feb 21
Fall sowing Aug 30 – Sep 13
Fall sowing Aug 30 – Sep 13
Fall sowing Oct 11 – Nov 1
Fall sowing Sep 13 – Sep 27
Plant Jan 31 – Feb 14
Based on the average last frost (Feb 28) and first frost (Nov 22). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.