When to plant in Delaware, OH
USDA Zone 6bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Delaware, Ohio — all computed from Delaware's nearest NOAA weather station.
These dates come from a station roughly 19 km away, the closest with full normals; terrain around Delaware (elevation, water, pavement) can move your real frost dates a few days either way. In zone 6b, Delaware gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
MARYSVILLE · 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 Delaware’s own odds, recorded at MARYSVILLE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 15 | Apr 30 | Apr 17 | Sep 30 | Oct 14 | Oct 27 |
| 32°F | May 5 | Apr 19 | Apr 5 | Oct 13 | Oct 26 | Nov 7 |
| 28°F | Apr 22 | Apr 7 | Mar 23 | Oct 25 | Nov 6 | Nov 21 |
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 Delaware, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 23 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.
Delaware planting FAQ
When is the last spring frost in Delaware, OH?
Plan for the last spring frost in Delaware around April 19 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Delaware, OH?
Expect Delaware's first fall frost near October 26 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Delaware in?
Delaware 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 Delaware?
Delaware has about 190 frost-free days — a moderate growing season — between the average last spring frost (April 19) and first fall frost (October 26).
When should I plant tomatoes in Delaware?
For Delaware, sow tomatoes indoors about February 22–March 8 and move the seedlings out around April 26, after the last spring frost.
Never miss a window in Delaware
An email when it’s time to start seeds, transplant, and sow — timed to Delaware’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Powell · 13 km
- Dublin · 20 km
- Worthington · 22 km
- Westerville · 23 km
- Marysville · 24 km
- Upper Arlington · 29 km
- Hilliard · 29 km
- Gahanna · 32 km
Frost dates recorded at MARYSVILLE, 19 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 Delaware, OH — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00334979. Retrieved from https://blissgarden.com/ohio/delaware.