Multnomah County, Oregon · Frost dates
Multnomah County frost dates.
First-frost, last-frost, and growing-season length for Multnomah County, Oregon. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 8b
32°F — light freeze
Last spring frost
- 10%
- 04-12
- 20%
- 04-02
- 50%
- 03-16
- 80%
- 02-26
- 90%
- 02-18
First fall frost
- 10%
- 10-30
- 20%
- 11-04
- 50%
- 11-20
- 80%
- 12-07
- 90%
- 12-17
28°F — killing freeze
Last spring freeze
- 10%
- 03-10
- 20%
- 03-01
- 50%
- 02-14
- 80%
- 01-15
- 90%
- 12-27
First fall freeze
- 10%
- 11-15
- 20%
- 11-25
- 50%
- 12-15
- 80%
- 01-16
- 90%
- 02-03
Growing season length (days, 28°F threshold)
- Short year
- 250
- Median
- 304
- Long year
- 403
Source NOAA station
PORTLAND TROUTDALE AP, OR US
0.5 mi · 30 yrs of record (1991–2020) · 29 ft elev.
Data from PORTLAND TROUTDALE AP, OR US, 0.5 miles away with 30-year NOAA record (1991-2020).
Bield Farm earns its predictions.
14-day free trial. No credit card. Cancel anytime.