Petroleum County, Montana · Frost dates
Petroleum County frost dates.
First-frost, last-frost, and growing-season length for Petroleum County, Montana. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-31
- 20%
- 05-26
- 50%
- 05-18
- 80%
- 05-10
- 90%
- 05-07
First fall frost
- 10%
- 09-07
- 20%
- 09-12
- 50%
- 09-21
- 80%
- 09-28
- 90%
- 10-02
28°F — killing freeze
Last spring freeze
- 10%
- 05-18
- 20%
- 05-14
- 50%
- 05-07
- 80%
- 04-30
- 90%
- 04-25
First fall freeze
- 10%
- 09-17
- 20%
- 09-21
- 50%
- 09-29
- 80%
- 10-07
- 90%
- 10-12
Growing season length (days, 28°F threshold)
- Short year
- 122
- Median
- 145
- Long year
- 170
Source NOAA station
VALENTINE, MT US
18.7 mi · 30 yrs of record (1991–2020) · 2905 ft elev.
Data from VALENTINE, MT US, 18.7 miles away with 30-year NOAA record (1991-2020).
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