Harper County, Oklahoma · Frost dates
Harper County frost dates.
First-frost, last-frost, and growing-season length for Harper County, Oklahoma. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 7a
32°F — light freeze
Last spring frost
- 10%
- 04-30
- 20%
- 04-27
- 50%
- 04-17
- 80%
- 04-07
- 90%
- 04-03
First fall frost
- 10%
- 10-08
- 20%
- 10-14
- 50%
- 10-23
- 80%
- 11-01
- 90%
- 11-04
28°F — killing freeze
Last spring freeze
- 10%
- 04-22
- 20%
- 04-17
- 50%
- 04-07
- 80%
- 03-28
- 90%
- 03-22
First fall freeze
- 10%
- 10-18
- 20%
- 10-22
- 50%
- 11-01
- 80%
- 11-10
- 90%
- 11-15
Growing season length (days, 28°F threshold)
- Short year
- 179
- Median
- 208
- Long year
- 238
Source NOAA station
BUFFALO 2 SSW, OK US
1.3 mi · 30 yrs of record (1991–2020) · 1931 ft elev.
Data from BUFFALO 2 SSW, OK US, 1.3 miles away with 30-year NOAA record (1991-2020).
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