Frost dates for 45015Hamilton, OH
The average last spring frost in Hamilton is April 22 and the average first fall frost is October 18, giving a typical growing season of about 178 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 22
- Average first fall frost
- Oct 18
- Growing season
- 178 days
Safer after May 10 (1-in-10 risk)
Possible by Oct 5 (1-in-10 risk)
Last frost typically in 173 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 18 · May 2 · May 19 | Sep 25 · Oct 7 · Oct 20 | 159 days | 100% |
| Frost / freeze (32°F) | Apr 6 · Apr 22 · May 10 | Oct 5 · Oct 18 · Oct 29 | 178 days | 100% |
| Hard freeze (28°F) | Mar 26 · Apr 8 · Apr 28 | Oct 15 · Oct 27 · Nov 8 | 200 days | 100% |
Planting calendar for Hamilton
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 22 – May 28 |
| Tomatoes | Transplant outdoors | May 8 – Jun 28 |
| Peppers | Start seeds indoors | Mar 22 – Apr 22 |
| Peppers | Transplant outdoors | May 22 – Jun 22 |
| Eggplant | Start seeds indoors | Apr 8 – May 7 |
| Eggplant | Transplant outdoors | May 22 – Jun 22 |
| Cucumbers | Sow outdoors | May 22 – Jul 8 |
| Summer squash | Sow outdoors | May 8 – Jun 22 |
| Winter squash & pumpkins | Sow outdoors | May 22 – Jun 22 |
| Snap beans | Sow outdoors | May 8 – Jul 31 |
| Sweet corn | Sow outdoors | May 8 – Jun 28 |
| Watermelon & cantaloupe | Sow outdoors | May 22 – Jun 22 |
| Okra | Sow outdoors | May 15 – Jun 7 |
| Peas | Sow outdoors (spring) | Mar 22 – May 7 |
| Potatoes | Plant outdoors (spring) | Mar 22 – May 22 |
| Onions | Start seeds indoors (spring) | Feb 8 – Mar 7 |
| Onions | Transplant outdoors (spring) | Apr 8 – May 7 |
| Broccoli | Start seeds indoors (spring) | Mar 4 – Apr 7 |
| Broccoli | Transplant outdoors (spring) | Apr 8 – May 7 |
| Broccoli | Start seeds indoors (fall) | Jun 18 – Jun 28 |
| Broccoli | Transplant outdoors (fall) | Jul 18 – Jul 29 |
| Cabbage | Start seeds indoors (spring) | Feb 22 – Mar 22 |
| Cabbage | Transplant outdoors (spring) | Mar 22 – Apr 22 |
| Cabbage | Start seeds indoors (fall) | Jun 8 – Jul 8 |
| Cabbage | Transplant outdoors (fall) | Jul 8 – Aug 8 |
| Leaf lettuce | Sow outdoors (spring) | Mar 22 – Jun 7 |
| Leaf lettuce | Sow outdoors (fall) | Jul 8 – Aug 24 |
| Spinach | Sow outdoors (spring) | Mar 15 – Apr 28 |
| Spinach | Sow outdoors (fall) | Jul 25 – Aug 29 |
| Radishes | Sow outdoors (spring) | Mar 22 – May 12 |
| Radishes | Sow outdoors (fall) | Jul 8 – Sep 8 |
| Kale | Sow outdoors (spring) | Apr 8 – Apr 28 |
| Kale | Sow outdoors (fall) | Jul 1 – Aug 8 |
| Carrots | Sow outdoors (spring) | Apr 22 – Jun 7 |
| Carrots | Sow outdoors (fall) | Jun 8 – Jul 24 |
| Garlic | Plant outdoors (fall) | Oct 8 – Nov 8 |
Where these dates come from
ZIP code 45015 is matched to the NOAA station Hamilton Butler Co Rgnl Ap, OH, 2 km away, at 634 ft elevation (30 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hamilton Butler Co Rgnl Ap, OH (used) | 634 ft | Apr 22 | Oct 18 |
| Fairfield, OH | 575 ft | Apr 19 | Oct 22 |
| Cheviot, OH | 891 ft | Apr 17 | Oct 26 |
| Cheviot 3 W, OH | 853 ft | Apr 16 | Oct 28 |
Frost dates near Hamilton
- Fairfield, OH 45014 · last Apr 22, first Oct 18
- Hamilton, OH 45011 · last Apr 22, first Oct 18
- Cincinnati, OH 45240 · last Apr 17, first Oct 26
- Ross, OH 45061 · last Apr 19, first Oct 22
- West Chester, OH 45071 · last Apr 22, first Oct 18
- Overpeck, OH 45055 · last Apr 22, first Oct 18
- Seven Mile, OH 45062 · last Apr 22, first Oct 18
- Shandon, OH 45063 · last Apr 19, first Oct 22
Frequently asked questions
- When is the last frost in Hamilton, OH?
- For ZIP code 45015, the average last spring frost (32°F) is April 22, based on NOAA 1991-2020 climate normals for the Hamilton Butler Co Rgnl Ap, OH weather station. There is a 1-in-10 chance of a frost after May 10.
- When is the first frost in Hamilton, OH?
- The average first fall frost (32°F) is October 18. There is a 1-in-10 chance of frost by October 5, so tender plants are at risk from that point on.
- How long is the growing season in 45015?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 178 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.