When to plant in Biddeford, ME
USDA Zone 6aBiddeford, Maine 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 Biddeford sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
KENNEBUNKPORT · 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 Biddeford’s own odds, recorded at KENNEBUNKPORT.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 2 | May 20 | May 7 | Sep 9 | Sep 24 | Oct 6 |
| 32°F | May 22 | May 9 | Apr 28 | Sep 20 | Oct 3 | Oct 19 |
| 28°F | May 12 | Apr 29 | Apr 16 | Sep 30 | Oct 15 | Nov 1 |
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 Biddeford, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 31 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.
Biddeford planting FAQ
When is the last spring frost in Biddeford, ME?
Biddeford's average last spring frost falls near May 9 — 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 Biddeford, ME?
The first fall frost in Biddeford typically arrives around October 3 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Biddeford in?
Biddeford 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 Biddeford?
There are roughly 147 frost-free days in Biddeford (a short growing season), running from the average last frost around May 9 to the first fall frost near October 3.
When should I plant tomatoes in Biddeford?
In Biddeford, start tomato seeds indoors around March 14–March 28, then transplant seedlings outdoors around May 16 once the danger of frost has passed.
Never miss a window in Biddeford
An email when it’s time to start seeds, transplant, and sow — timed to Biddeford’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Saco · 10 km
- South Portland · 23 km
- Portland · 27 km
- Sanford · 30 km
- Westbrook · 30 km
- Somersworth · 45 km
- Dover · 49 km
- Rochester · 50 km
Frost dates recorded at KENNEBUNKPORT, 11 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 Biddeford, ME — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00174193. Retrieved from https://blissgarden.com/maine/biddeford.