Frost Dates for Owasso, OK
In Owasso, OK, the average last spring frost is around Mar 31 and the average first fall frost around Nov 4, for a growing season of about 220 days. For frost-tender plants, wait until Apr 15, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Tulsa Intl. Airport, OK weather station, 7 miles away, elevation 650 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 15 | Oct 20 |
| 20% | Apr 9 | Oct 26 |
| 30% | Apr 5 | Oct 30 |
| 40% | Apr 2 | Nov 1 |
| 50% | Mar 31 | Nov 4 |
| 60% | Mar 27 | Nov 6 |
| 70% | Mar 23 | Nov 9 |
| 80% | Mar 18 | Nov 12 |
| 90% | Mar 11 | Nov 19 |
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 10 | Oct 26 |
| Frost / freeze (32°F) | Mar 31 | Nov 4 |
| Hard freeze (28°F) | Mar 17 | Nov 13 |
Planting calendar for Owasso
Transplant Apr 7 – Apr 21
Transplant Apr 14 – Apr 28
Transplant Apr 14 – Apr 28
Transplant Apr 7 – Apr 21
Sow or transplant Apr 7 – Apr 21
Sow or transplant Apr 7 – Apr 21
Sow or transplant Apr 14 – Apr 28
Sow or transplant Mar 3 – Mar 17
Fall sowing Sep 9 – Oct 7
Fall sowing Sep 9 – Sep 30
Fall sowing Aug 26 – Sep 9
Sow or transplant Mar 3 – Mar 17
Fall sowing Aug 26 – Sep 23
Transplant Mar 17 – Mar 31
Fall sowing Aug 12 – Aug 26
Transplant Mar 10 – Mar 24
Fall sowing Aug 12 – Aug 26
Fall sowing Aug 12 – Aug 26
Fall sowing Sep 23 – Oct 14
Fall sowing Aug 26 – Sep 9
Plant Mar 3 – Mar 17
Based on the average last frost (Mar 31) and first frost (Nov 4). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.