Clackamas County, Oregon · Frost dates
Clackamas County frost dates.
First-frost, last-frost, and growing-season length for Clackamas County, Oregon. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 04-30
- 20%
- 04-23
- 50%
- 04-05
- 80%
- 03-21
- 90%
- 03-13
First fall frost
- 10%
- 10-20
- 20%
- 10-26
- 50%
- 11-08
- 80%
- 11-24
- 90%
- 12-01
28°F — killing freeze
Last spring freeze
- 10%
- 03-24
- 20%
- 03-14
- 50%
- 02-26
- 80%
- 02-04
- 90%
- 01-13
First fall freeze
- 10%
- 11-06
- 20%
- 11-13
- 50%
- 11-30
- 80%
- 12-18
- 90%
- 12-30
Growing season length (days, 28°F threshold)
- Short year
- 227
- Median
- 277
- Long year
- 351
Source NOAA station
THREE LYNX, OR US
6.7 mi · 30 yrs of record (1991–2020) · 1120 ft elev.
Data from THREE LYNX, OR US, 6.7 miles away with 30-year NOAA record (1991-2020).
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