When to plant in Brunswick, ME
USDA Zone 5bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Brunswick, Maine — all computed from Brunswick's nearest NOAA weather station.
In zone 5b, Brunswick gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
BRUNSWICK NAS · 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 Brunswick’s own odds, recorded at BRUNSWICK NAS.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 26 | May 13 | May 2 | Sep 20 | Oct 1 | Oct 12 |
| 32°F | May 14 | May 2 | Apr 24 | Sep 29 | Oct 10 | Oct 27 |
| 28°F | May 1 | Apr 22 | Apr 10 | Oct 8 | Oct 23 | 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 Brunswick, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
Brunswick planting FAQ
When is the last spring frost in Brunswick, ME?
Plan for the last spring frost in Brunswick around May 2 (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 Brunswick, ME?
In Brunswick, 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 Brunswick in?
Brunswick 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 Brunswick?
Brunswick 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 Brunswick?
For Brunswick, 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 Brunswick
An email when it’s time to start seeds, transplant, and sow — timed to Brunswick’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at BRUNSWICK NAS, 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 Brunswick, ME — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014611. Retrieved from https://blissgarden.com/maine/brunswick.