Frost Dates for Atascadero, CA
In Atascadero, CA, the average last spring frost is around Mar 15 and the average first fall frost around Nov 10, for a growing season of about 238 days. For frost-tender plants, wait until Apr 13, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Paso Robles, CA weather station, 10 miles away, elevation 730 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 13 | Oct 23 |
| 20% | Apr 6 | Oct 30 |
| 30% | Mar 31 | Nov 1 |
| 40% | Mar 25 | Nov 5 |
| 50% | Mar 15 | Nov 10 |
| 60% | Mar 8 | Nov 14 |
| 70% | Feb 28 | Nov 18 |
| 80% | Feb 24 | Nov 22 |
| 90% | Feb 12 | Nov 29 |
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 18 | Oct 27 |
| Frost / freeze (32°F) | Mar 15 | Nov 10 |
| Hard freeze (28°F) | Feb 9 | Nov 26 |
Planting calendar for Atascadero
Transplant Mar 22 – Apr 5
Transplant Mar 29 – Apr 12
Transplant Mar 29 – Apr 12
Transplant Mar 22 – Apr 5
Sow or transplant Mar 22 – Apr 5
Sow or transplant Mar 22 – Apr 5
Sow or transplant Mar 29 – Apr 12
Sow or transplant Feb 15 – Mar 1
Fall sowing Sep 15 – Oct 13
Fall sowing Sep 15 – Oct 6
Fall sowing Sep 1 – Sep 15
Sow or transplant Feb 15 – Mar 1
Fall sowing Sep 1 – Sep 29
Transplant Mar 1 – Mar 15
Fall sowing Aug 18 – Sep 1
Transplant Feb 22 – Mar 8
Fall sowing Aug 18 – Sep 1
Fall sowing Aug 18 – Sep 1
Fall sowing Sep 29 – Oct 20
Fall sowing Sep 1 – Sep 15
Plant Feb 15 – Mar 1
Based on the average last frost (Mar 15) and first frost (Nov 10). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.