When to plant in Andover, MN
USDA Zone 4bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Andover, Minnesota — all computed from Andover's nearest NOAA weather station.
In zone 4b, Andover winters are severe; choose cold-hardy perennials and time annuals carefully around the frost dates above.
Frost probability
ANDOVER 1N · 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 Andover’s own odds, recorded at ANDOVER 1N.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 31 | May 16 | May 2 | Sep 10 | Sep 24 | Oct 6 |
| 32°F | May 21 | May 5 | Apr 23 | Sep 18 | Oct 2 | Oct 16 |
| 28°F | May 9 | Apr 25 | Apr 11 | Sep 27 | Oct 13 | Oct 27 |
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 Andover, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Andover planting FAQ
When is the last spring frost in Andover, MN?
On average, the last spring frost in Andover is around May 5 (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 Andover, MN?
Expect Andover's first fall frost near October 2 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Andover in?
Andover is in USDA hardiness zone 4b. In zone 4b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Andover?
Andover has about 150 frost-free days — a moderate growing season — between the average last spring frost (May 5) and first fall frost (October 2).
When should I plant tomatoes in Andover?
For Andover, sow tomatoes indoors about March 10–March 24 and move the seedlings out around May 12, after the last spring frost.
Never miss a window in Andover
An email when it’s time to start seeds, transplant, and sow — timed to Andover’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Anoka · 6 km
- Coon Rapids · 9 km
- Ramsey · 9 km
- Champlin · 10 km
- Ham Lake · 11 km
- Blaine · 14 km
- East Bethel · 15 km
- Brooklyn Park · 16 km
Frost dates recorded at ANDOVER 1N, 3 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 Andover, MN — Frost Dates & Zone 4b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00210190. Retrieved from https://blissgarden.com/minnesota/andover.