Frost Dates for Mason, OH
In Mason, 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, 12 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 Mason
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.