Frost Dates for St. Petersburg, FL
In St. Petersburg, FL, the average last spring frost is around Jan 17 and the average first fall frost around Jan 15, for a growing season of about 365 days. For frost-tender plants, wait until Feb 5, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the St Petersburg, FL weather station, 1 mile away, elevation 8 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 5 | Dec 23 |
| 20% | Feb 1 | Jan 2 |
| 30% | Jan 28 | Jan 7 |
| 40% | Jan 21 | Jan 11 |
| 50% | Jan 17 | Jan 15 |
| 60% | Jan 12 | Jan 20 |
| 70% | Jan 8 | Jan 28 |
| 80% | Jan 3 | Jan 31 |
| 90% | Dec 31 | Feb 5 |
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) | Jan 22 | Jan 13 |
| Frost / freeze (32°F) | Jan 17 | Jan 15 |
| Hard freeze (28°F) | — | — |
Planting calendar for St. Petersburg
Transplant Jan 24 – Feb 7
Transplant Jan 31 – Feb 14
Transplant Jan 31 – Feb 14
Transplant Jan 24 – Feb 7
Sow or transplant Jan 24 – Feb 7
Sow or transplant Jan 24 – Feb 7
Sow or transplant Jan 31 – Feb 14
Sow or transplant Dec 20 – Jan 3
Fall sowing Nov 20 – Dec 18
Fall sowing Nov 20 – Dec 11
Fall sowing Nov 6 – Nov 20
Sow or transplant Dec 20 – Jan 3
Fall sowing Nov 6 – Dec 4
Transplant Jan 3 – Jan 17
Fall sowing Oct 23 – Nov 6
Transplant Dec 27 – Jan 10
Fall sowing Oct 23 – Nov 6
Fall sowing Oct 23 – Nov 6
Fall sowing Dec 4 – Dec 25
Fall sowing Nov 6 – Nov 20
Plant Dec 20 – Jan 3
Based on the average last frost (Jan 17) and first frost (Jan 15). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.