When to plant in Troy, OH
USDA Zone 6aTroy, Ohio frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 6a means Troy sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
PIQUA WWTP · 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 Troy’s own odds, recorded at PIQUA WWTP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 14 | Apr 29 | Apr 16 | Sep 30 | Oct 13 | Oct 25 |
| 32°F | May 5 | Apr 18 | Apr 5 | Oct 9 | Oct 23 | Nov 4 |
| 28°F | Apr 20 | Apr 5 | Mar 23 | Oct 20 | Nov 3 | Nov 18 |
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 Troy, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Troy planting FAQ
When is the last spring frost in Troy, OH?
On average, the last spring frost in Troy is around April 18 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Troy, OH?
The first fall frost in Troy typically arrives around October 23 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Troy in?
Troy is in USDA hardiness zone 6a. In zone 6a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Troy?
There are roughly 188 frost-free days in Troy (a moderate growing season), running from the average last frost around April 18 to the first fall frost near October 23.
When should I plant tomatoes in Troy?
In Troy, start tomato seeds indoors around February 21–March 7, then transplant seedlings outdoors around April 25 once the danger of frost has passed.
Never miss a window in Troy
An email when it’s time to start seeds, transplant, and sow — timed to Troy’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at PIQUA WWTP, 10 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 Troy, OH — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00336650. Retrieved from https://blissgarden.com/ohio/troy.