When to plant in Waterville, ME
USDA Zone 5bEverything below — frost dates, hardiness zone, and what to plant when in Waterville, Maine — is derived from the closest NOAA station with complete climate normals.
In zone 5b, Waterville gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average last spring frost in Waterville is now 5 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
WATERVILLE TRTMT PLT · 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 Waterville’s own odds, recorded at WATERVILLE TRTMT PLT.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 27 | May 14 | May 3 | Sep 19 | Oct 1 | Oct 11 |
| 32°F | May 14 | May 2 | Apr 23 | Sep 30 | Oct 10 | Oct 27 |
| 28°F | May 3 | Apr 22 | Apr 10 | Oct 7 | Oct 24 | Nov 7 |
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 Waterville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 29 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.
Waterville planting FAQ
When is the last spring frost in Waterville, ME?
On average, the last spring frost in Waterville is around May 2 (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 Waterville, ME?
In Waterville, the first 32°F freeze of fall lands around October 10 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Waterville in?
Waterville 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 Waterville?
Waterville has about 161 frost-free days — a moderate growing season — between the average last spring frost (May 2) and first fall frost (October 10).
When should I plant tomatoes in Waterville?
For Waterville, sow tomatoes indoors about March 7–March 21 and move the seedlings out around May 9, after the last spring frost.
Never miss a window in Waterville
An email when it’s time to start seeds, transplant, and sow — timed to Waterville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at WATERVILLE TRTMT PLT, 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 Waterville, ME — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00179151. Retrieved from https://blissgarden.com/maine/waterville.