Valley County, Montana · Frost dates
Valley County frost dates.
First-frost, last-frost, and growing-season length for Valley County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-26
- 20%
- 05-22
- 50%
- 05-13
- 80%
- 05-06
- 90%
- 05-02
First fall frost
- 10%
- 09-13
- 20%
- 09-19
- 50%
- 09-27
- 80%
- 10-04
- 90%
- 10-09
28°F — killing freeze
Last spring freeze
- 10%
- 05-16
- 20%
- 05-11
- 50%
- 05-03
- 80%
- 04-24
- 90%
- 04-19
First fall freeze
- 10%
- 09-22
- 20%
- 09-26
- 50%
- 10-05
- 80%
- 10-16
- 90%
- 10-21
Growing season length (days, 28°F threshold)
- Short year
- 129
- Median
- 155
- Long year
- 185
Source NOAA station
ST MARIE, MT US
8.2 mi · 30 yrs of record (1991–2020) · 2756 ft elev.
Data from ST MARIE, MT US, 8.2 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.