Frost Dates for Eureka, CA
In Eureka, CA, the average last spring frost is around Feb 22 and the average first fall frost around Dec 7, for a growing season of about 293 days. For frost-tender plants, wait until Mar 23, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Eureka Wfo Woodley Island, CA weather station, under 1 mile away, elevation 20 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 23 | Nov 15 |
| 20% | Mar 14 | Nov 21 |
| 30% | Mar 4 | Nov 28 |
| 40% | Feb 28 | Dec 2 |
| 50% | Feb 22 | Dec 7 |
| 60% | Feb 13 | Dec 11 |
| 70% | Feb 2 | Dec 17 |
| 80% | Jan 18 | Dec 27 |
| 90% | Dec 31 | Jan 11 |
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 1 | Nov 12 |
| Frost / freeze (32°F) | Feb 22 | Dec 7 |
| Hard freeze (28°F) | Jan 3 | Dec 25 |
Planting calendar for Eureka
Transplant Mar 1 – Mar 15
Transplant Mar 8 – Mar 22
Transplant Mar 8 – Mar 22
Transplant Mar 1 – Mar 15
Sow or transplant Mar 1 – Mar 15
Sow or transplant Mar 1 – Mar 15
Sow or transplant Mar 8 – Mar 22
Sow or transplant Jan 25 – Feb 8
Fall sowing Oct 12 – Nov 9
Fall sowing Oct 12 – Nov 2
Fall sowing Sep 28 – Oct 12
Sow or transplant Jan 25 – Feb 8
Fall sowing Sep 28 – Oct 26
Transplant Feb 8 – Feb 22
Fall sowing Sep 14 – Sep 28
Transplant Feb 1 – Feb 15
Fall sowing Sep 14 – Sep 28
Fall sowing Sep 14 – Sep 28
Fall sowing Oct 26 – Nov 16
Fall sowing Sep 28 – Oct 12
Plant Jan 25 – Feb 8
Based on the average last frost (Feb 22) and first frost (Dec 7). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.