When to plant in Cambridge, MN
USDA Zone 4bCambridge, Minnesota frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 4b, Cambridge winters are severe; choose cold-hardy perennials and time annuals carefully around the frost dates above.
Frost probability
CAMBRIDGE · 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 Cambridge’s own odds, recorded at CAMBRIDGE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 28 | May 13 | Apr 29 | Sep 11 | Sep 26 | Oct 10 |
| 32°F | May 20 | May 2 | Apr 17 | Sep 20 | Oct 4 | Oct 19 |
| 28°F | May 6 | Apr 21 | Apr 6 | Sep 28 | Oct 15 | Nov 3 |
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 Cambridge, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 35 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.
Cambridge planting FAQ
When is the last spring frost in Cambridge, MN?
Plan for the last spring frost in Cambridge 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 Cambridge, MN?
Expect Cambridge's first fall frost near October 4 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Cambridge in?
Cambridge 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 Cambridge?
Cambridge has about 155 frost-free days — a moderate growing season — between the average last spring frost (May 2) and first fall frost (October 4).
When should I plant tomatoes in Cambridge?
For Cambridge, 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 Cambridge
An email when it’s time to start seeds, transplant, and sow — timed to Cambridge’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- North Branch · 22 km
- East Bethel · 23 km
- Ham Lake · 34 km
- Andover · 35 km
- Elk River · 37 km
- Ramsey · 38 km
- Forest Lake · 40 km
- Anoka · 41 km
Frost dates recorded at CAMBRIDGE, 1 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 Cambridge, MN — Frost Dates & Zone 4b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00211227. Retrieved from https://blissgarden.com/minnesota/cambridge.