When to plant in Newburyport, MA
USDA Zone 6bEverything below — frost dates, hardiness zone, and what to plant when in Newburyport, Massachusetts — is derived from the closest NOAA station with complete climate normals.
Zone 6b means Newburyport sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
GROVELAND · 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 Newburyport’s own odds, recorded at GROVELAND.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 27 | May 15 | May 3 | Sep 17 | Sep 30 | Oct 10 |
| 32°F | May 17 | May 3 | Apr 22 | Sep 28 | Oct 8 | Oct 23 |
| 28°F | May 4 | Apr 21 | Apr 7 | Oct 5 | Oct 20 | Nov 4 |
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 Newburyport, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Newburyport planting FAQ
When is the last spring frost in Newburyport, MA?
Newburyport's average last spring frost falls near May 3 — 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 Newburyport, MA?
The first fall frost in Newburyport typically arrives around October 8 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Newburyport in?
Newburyport is in USDA hardiness zone 6b. In zone 6b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Newburyport?
There are roughly 158 frost-free days in Newburyport (a moderate growing season), running from the average last frost around May 3 to the first fall frost near October 8.
When should I plant tomatoes in Newburyport?
In Newburyport, start tomato seeds indoors around March 8–March 22, then transplant seedlings outdoors around May 10 once the danger of frost has passed.
Never miss a window in Newburyport
An email when it’s time to start seeds, transplant, and sow — timed to Newburyport’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at GROVELAND, 15 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 Newburyport, MA — Frost Dates & Zone 6b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00193276. Retrieved from https://blissgarden.com/massachusetts/newburyport.