Frost Dates for Jurupa Valley, CA
In Jurupa Valley, CA, the average last spring frost is around Jan 9 and the average first fall frost around Dec 30, for a growing season of about 362 days. For frost-tender plants, wait until Feb 21, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Riverside Muni Airport, CA weather station, 4 miles away, elevation 805 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% | Feb 21 | Dec 5 |
| 20% | Feb 4 | Dec 14 |
| 30% | Jan 29 | Dec 19 |
| 40% | Jan 16 | Dec 24 |
| 50% | Jan 9 | Dec 30 |
| 60% | Jan 4 | Jan 3 |
| 70% | Dec 30 | Jan 8 |
| 80% | Dec 23 | Jan 21 |
| 90% | Dec 16 | Feb 6 |
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) | Feb 13 | Dec 12 |
| Frost / freeze (32°F) | Jan 9 | Dec 30 |
| Hard freeze (28°F) | — | — |
Planting calendar for Jurupa Valley
Transplant Jan 16 – Jan 30
Transplant Jan 23 – Feb 6
Transplant Jan 23 – Feb 6
Transplant Jan 16 – Jan 30
Sow or transplant Jan 16 – Jan 30
Sow or transplant Jan 16 – Jan 30
Sow or transplant Jan 23 – Feb 6
Sow or transplant Dec 12 – Dec 26
Fall sowing Nov 4 – Dec 2
Fall sowing Nov 4 – Nov 25
Fall sowing Oct 21 – Nov 4
Sow or transplant Dec 12 – Dec 26
Fall sowing Oct 21 – Nov 18
Transplant Dec 26 – Jan 9
Fall sowing Oct 7 – Oct 21
Transplant Dec 19 – Jan 2
Fall sowing Oct 7 – Oct 21
Fall sowing Oct 7 – Oct 21
Fall sowing Nov 18 – Dec 9
Fall sowing Oct 21 – Nov 4
Plant Dec 12 – Dec 26
Based on the average last frost (Jan 9) and first frost (Dec 30). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.