Frost Dates for Hamilton, OH
In Hamilton, OH, the average last spring frost is around Apr 22 and the average first fall frost around Oct 18, for a growing season of about 178 days. For frost-tender plants, wait until May 10, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Hamilton Butler Co Rgnl Airport, OH weather station, 3 miles away, elevation 634 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 10 | Oct 5 |
| 20% | May 4 | Oct 9 |
| 30% | Apr 29 | Oct 12 |
| 40% | Apr 25 | Oct 15 |
| 50% | Apr 22 | Oct 18 |
| 60% | Apr 18 | Oct 20 |
| 70% | Apr 15 | Oct 23 |
| 80% | Apr 11 | Oct 25 |
| 90% | Apr 6 | Oct 29 |
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) | May 2 | Oct 7 |
| Frost / freeze (32°F) | Apr 22 | Oct 18 |
| Hard freeze (28°F) | Apr 8 | Oct 27 |
Planting calendar for Hamilton
Transplant Apr 29 – May 13
Transplant May 6 – May 20
Transplant May 6 – May 20
Transplant Apr 29 – May 13
Sow or transplant Apr 29 – May 13
Sow or transplant Apr 29 – May 13
Sow or transplant May 6 – May 20
Sow or transplant Mar 25 – Apr 8
Fall sowing Aug 23 – Sep 20
Fall sowing Aug 23 – Sep 13
Fall sowing Aug 9 – Aug 23
Sow or transplant Mar 25 – Apr 8
Fall sowing Aug 9 – Sep 6
Transplant Apr 8 – Apr 22
Fall sowing Jul 26 – Aug 9
Transplant Apr 1 – Apr 15
Fall sowing Jul 26 – Aug 9
Fall sowing Jul 26 – Aug 9
Fall sowing Sep 6 – Sep 27
Fall sowing Aug 9 – Aug 23
Plant Mar 25 – Apr 8
Based on the average last frost (Apr 22) and first frost (Oct 18). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.