Frost Dates for Morgan Hill, CA
In Morgan Hill, CA, the average last spring frost is around Feb 24 and the average first fall frost around Nov 27, for a growing season of about 277 days. For frost-tender plants, wait until Apr 4, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Gilroy, CA weather station, 10 miles away, elevation 194 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 4 | Nov 10 |
| 20% | Mar 21 | Nov 16 |
| 30% | Mar 8 | Nov 20 |
| 40% | Mar 1 | Nov 23 |
| 50% | Feb 24 | Nov 27 |
| 60% | Feb 17 | Dec 1 |
| 70% | Feb 11 | Dec 4 |
| 80% | Feb 1 | Dec 9 |
| 90% | Jan 23 | 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) | Apr 4 | Nov 10 |
| Frost / freeze (32°F) | Feb 24 | Nov 27 |
| Hard freeze (28°F) | Jan 16 | Dec 12 |
Planting calendar for Morgan Hill
Transplant Mar 3 – Mar 17
Transplant Mar 10 – Mar 24
Transplant Mar 10 – Mar 24
Transplant Mar 3 – Mar 17
Sow or transplant Mar 3 – Mar 17
Sow or transplant Mar 3 – Mar 17
Sow or transplant Mar 10 – Mar 24
Sow or transplant Jan 27 – Feb 10
Fall sowing Oct 2 – Oct 30
Fall sowing Oct 2 – Oct 23
Fall sowing Sep 18 – Oct 2
Sow or transplant Jan 27 – Feb 10
Fall sowing Sep 18 – Oct 16
Transplant Feb 10 – Feb 24
Fall sowing Sep 4 – Sep 18
Transplant Feb 3 – Feb 17
Fall sowing Sep 4 – Sep 18
Fall sowing Sep 4 – Sep 18
Fall sowing Oct 16 – Nov 6
Fall sowing Sep 18 – Oct 2
Plant Jan 27 – Feb 10
Based on the average last frost (Feb 24) and first frost (Nov 27). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.