When to plant in Kalispell, MT
USDA Zone 5bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Kalispell, Montana — all computed from Kalispell's nearest NOAA weather station.
A ~102-day frost-free window makes Kalispell a short-season garden: choose early varieties and start long-season crops indoors well ahead of the last frost. Zone 5b means Kalispell sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
KALISPELL GLACIER AP · 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 Kalispell’s own odds, recorded at KALISPELL GLACIER AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 32°F | Jun 22 | May 31 | May 13 | Aug 26 | Sep 10 | Sep 25 |
| 28°F | May 26 | May 10 | Apr 28 | Sep 9 | Sep 27 | Oct 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 Kalispell, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 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.
Kalispell planting FAQ
When is the last spring frost in Kalispell, MT?
Plan for the last spring frost in Kalispell around May 31 (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 Kalispell, MT?
The first fall frost in Kalispell typically arrives around September 10 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Kalispell in?
Kalispell 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 Kalispell?
There are roughly 102 frost-free days in Kalispell (a short growing season), running from the average last frost around May 31 to the first fall frost near September 10.
When should I plant tomatoes in Kalispell?
In Kalispell, start tomato seeds indoors around April 5–April 19, then transplant seedlings outdoors around June 7 once the danger of frost has passed.
Never miss a window in Kalispell
An email when it’s time to start seeds, transplant, and sow — timed to Kalispell’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Missoula · 151 km
- Hayden · 191 km
- Coeur d'Alene · 192 km
- Rathdrum · 197 km
- Post Falls · 202 km
- Liberty Lake · 216 km
- Spokane Valley · 225 km
- Spokane · 239 km
Frost dates recorded at KALISPELL GLACIER AP, 11 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 Kalispell, MT — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00244558. Retrieved from https://blissgarden.com/montana/kalispell.