When to plant in Marietta, OH
USDA Zone 6bEverything below — frost dates, hardiness zone, and what to plant when in Marietta, Ohio — is derived from the closest NOAA station with complete climate normals.
Zone 6b means Marietta 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 Marietta is now 7 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
MARIETTA 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 Marietta’s own odds, recorded at MARIETTA WWTP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 17 | Apr 30 | Apr 16 | Oct 3 | Oct 16 | Oct 29 |
| 32°F | May 4 | Apr 18 | Apr 5 | Oct 13 | Oct 27 | Nov 6 |
| 28°F | Apr 19 | Apr 5 | Mar 22 | Oct 24 | Nov 5 | Nov 19 |
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 Marietta, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
Marietta planting FAQ
When is the last spring frost in Marietta, OH?
On average, the last spring frost in Marietta 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 Marietta, OH?
The first fall frost in Marietta typically arrives around October 27 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Marietta in?
Marietta 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 Marietta?
There are roughly 192 frost-free days in Marietta (a moderate growing season), running from the average last frost around April 18 to the first fall frost near October 27.
When should I plant tomatoes in Marietta?
In Marietta, 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 Marietta
An email when it’s time to start seeds, transplant, and sow — timed to Marietta’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Vienna · 13 km
- Parkersburg · 20 km
- Athens · 57 km
- Cambridge · 68 km
- Zanesville · 77 km
- Clarksburg · 95 km
- Wheeling · 97 km
- Coshocton · 99 km
Frost dates recorded at MARIETTA WWTP, 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 Marietta, OH — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00334927. Retrieved from https://blissgarden.com/ohio/marietta.