When to plant in Sanford, ME
USDA Zone 5bEverything below — frost dates, hardiness zone, and what to plant when in Sanford, Maine — is derived from the closest NOAA station with complete climate normals.
In zone 5b, Sanford gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average last spring frost in Sanford is now 10 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
SANFORD 2 NNW · 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 Sanford’s own odds, recorded at SANFORD 2 NNW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 6 | May 26 | May 15 | Sep 6 | Sep 20 | Oct 1 |
| 32°F | May 29 | May 16 | May 2 | Sep 18 | Sep 30 | Oct 10 |
| 28°F | May 17 | May 2 | Apr 21 | Sep 28 | Oct 7 | Oct 24 |
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 Sanford, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 24 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.
Sanford planting FAQ
When is the last spring frost in Sanford, ME?
On average, the last spring frost in Sanford is around May 16 (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 Sanford, ME?
Expect Sanford's first fall frost near September 30 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Sanford in?
Sanford is in USDA hardiness zone 5b. In zone 5b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Sanford?
Sanford has about 137 frost-free days — a short growing season — between the average last spring frost (May 16) and first fall frost (September 30).
When should I plant tomatoes in Sanford?
For Sanford, sow tomatoes indoors about March 21–April 4 and move the seedlings out around May 23, after the last spring frost.
Never miss a window in Sanford
An email when it’s time to start seeds, transplant, and sow — timed to Sanford’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Somersworth · 22 km
- Rochester · 23 km
- Dover · 28 km
- Biddeford · 30 km
- Saco · 30 km
- Durham · 34 km
- Portsmouth · 40 km
- South Portland · 44 km
Frost dates recorded at SANFORD 2 NNW, 4 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 Sanford, ME — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00177479. Retrieved from https://blissgarden.com/maine/sanford.