Frost Dates for Delaware, OH
In Delaware, OH, the average last spring frost is around Apr 19 and the average first fall frost around Oct 26, for a growing season of about 188 days. For frost-tender plants, wait until May 5, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Marysville, OH weather station, 12 miles away, elevation 970 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% | May 5 | Oct 13 |
| 20% | Apr 29 | Oct 18 |
| 30% | Apr 25 | Oct 21 |
| 40% | Apr 22 | Oct 24 |
| 50% | Apr 19 | Oct 26 |
| 60% | Apr 17 | Oct 29 |
| 70% | Apr 13 | Oct 31 |
| 80% | Apr 10 | Nov 3 |
| 90% | Apr 5 | Nov 7 |
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 30 | Oct 14 |
| Frost / freeze (32°F) | Apr 19 | Oct 26 |
| Hard freeze (28°F) | Apr 7 | Nov 6 |
Planting calendar for Delaware
Transplant Apr 26 – May 10
Transplant May 3 – May 17
Transplant May 3 – May 17
Transplant Apr 26 – May 10
Sow or transplant Apr 26 – May 10
Sow or transplant Apr 26 – May 10
Sow or transplant May 3 – May 17
Sow or transplant Mar 22 – Apr 5
Fall sowing Aug 31 – Sep 28
Fall sowing Aug 31 – Sep 21
Fall sowing Aug 17 – Aug 31
Sow or transplant Mar 22 – Apr 5
Fall sowing Aug 17 – Sep 14
Transplant Apr 5 – Apr 19
Fall sowing Aug 3 – Aug 17
Transplant Mar 29 – Apr 12
Fall sowing Aug 3 – Aug 17
Fall sowing Aug 3 – Aug 17
Fall sowing Sep 14 – Oct 5
Fall sowing Aug 17 – Aug 31
Plant Mar 22 – Apr 5
Based on the average last frost (Apr 19) and first frost (Oct 26). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.