When to plant in Circleville, OH
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Circleville, Ohio — all computed from Circleville's nearest NOAA weather station.
Zone 6b means Circleville sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
The average first fall frost in Circleville is now 9 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
CIRCLEVILLE · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Circleville’s own odds, recorded at CIRCLEVILLE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 14 | Apr 28 | Apr 13 | Oct 4 | Oct 17 | Oct 30 |
| 32°F | May 4 | Apr 17 | Apr 2 | Oct 14 | Oct 28 | Nov 9 |
| 28°F | Apr 23 | Apr 4 | Mar 20 | Oct 26 | Nov 7 | Nov 23 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Circleville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 29 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Circleville planting FAQ
When is the last spring frost in Circleville, OH?
Circleville's average last spring frost falls near April 17 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Circleville, OH?
The first fall frost in Circleville typically arrives around October 28 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Circleville in?
Circleville is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Circleville?
There are roughly 194 frost-free days in Circleville (a moderate growing season), running from the average last frost around April 17 to the first fall frost near October 28.
When should I plant tomatoes in Circleville?
In Circleville, start tomato seeds indoors around February 20–March 6, then transplant seedlings outdoors around April 24 once the danger of frost has passed.
Never miss a window in Circleville
An email when it’s time to start seeds, transplant, and sow — timed to Circleville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Canal Winchester · 29 km
- Chillicothe · 29 km
- Lancaster · 31 km
- Grove City · 32 km
- Pickerington · 35 km
- Bexley · 40 km
- Whitehall · 41 km
- Reynoldsburg · 42 km
Frost dates recorded at CIRCLEVILLE, 2 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Circleville, OH — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00331592. Retrieved from https://blissgarden.com/ohio/circleville.