When to plant in London, OH
USDA Zone 6aEverything below — frost dates, hardiness zone, and what to plant when in London, Ohio — is derived from the closest NOAA station with complete climate normals.
Zone 6a means London 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 London is now 9 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
LONDON FISH HATCHERY · 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 London’s own odds, recorded at LONDON FISH HATCHERY.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 20 | May 4 | Apr 20 | Sep 23 | Oct 7 | Oct 20 |
| 32°F | May 10 | Apr 24 | Apr 10 | Oct 5 | Oct 18 | Nov 1 |
| 28°F | Apr 30 | Apr 14 | Mar 31 | Oct 15 | Oct 29 | Nov 12 |
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 London, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 37 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.
London planting FAQ
When is the last spring frost in London, OH?
London's average last spring frost falls near April 24 — 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 London, OH?
In London, the first 32°F freeze of fall lands around October 18 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is London in?
London 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 London?
There are roughly 177 frost-free days in London (a moderate growing season), running from the average last frost around April 24 to the first fall frost near October 18.
When should I plant tomatoes in London?
In London, 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 London
An email when it’s time to start seeds, transplant, and sow — timed to London’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Hilliard · 29 km
- Springfield · 31 km
- Grove City · 32 km
- Upper Arlington · 35 km
- Dublin · 35 km
- Urbana · 36 km
- Marysville · 37 km
- Washington Court House · 39 km
Frost dates recorded at LONDON FISH HATCHERY, 6 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 London, OH — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00334681. Retrieved from https://blissgarden.com/ohio/london.