When to plant in Middletown, OH
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Middletown, Ohio — all computed from Middletown's nearest NOAA weather station.
Zone 6b means Middletown sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
FRANKLIN · 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 Middletown’s own odds, recorded at FRANKLIN.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 19 | May 4 | Apr 20 | Sep 27 | Oct 9 | Oct 21 |
| 32°F | May 11 | Apr 24 | Apr 9 | Oct 7 | Oct 19 | Nov 1 |
| 28°F | Apr 30 | Apr 11 | Mar 26 | Oct 16 | Oct 29 | Nov 11 |
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 Middletown, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 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.
Middletown planting FAQ
When is the last spring frost in Middletown, OH?
On average, the last spring frost in Middletown is around April 24 (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 Middletown, OH?
In Middletown, the first 32°F freeze of fall lands around October 19 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Middletown in?
Middletown 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 Middletown?
There are roughly 178 frost-free days in Middletown (a moderate growing season), running from the average last frost around April 24 to the first fall frost near October 19.
When should I plant tomatoes in Middletown?
In Middletown, start tomato seeds indoors around February 27–March 13, then transplant seedlings outdoors around May 1 once the danger of frost has passed.
Never miss a window in Middletown
An email when it’s time to start seeds, transplant, and sow — timed to Middletown’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Monroe · 6 km
- Franklin · 8 km
- Trenton · 9 km
- Springboro · 13 km
- Lebanon · 16 km
- Miamisburg · 16 km
- Mason · 17 km
- West Carrollton · 21 km
Frost dates recorded at FRANKLIN, 7 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 Middletown, OH — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00332928. Retrieved from https://blissgarden.com/ohio/middletown.