Frost Dates for Portland, OR

Based on data from Portland Kgw-Tv weather station, 1 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. February 25
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. December 1
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.

Last Spring Frost March 6
First Fall Frost November 22

Hard Freeze (28°F)

Last Spring Hard Freeze January 31
First Fall Hard Freeze December 20
45.52°N, -122.68°W © OpenStreetMap

Growing Season

280 Days February 25 to December 1

USDA Hardiness Zone iHardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.

Zone 9a

Avg. annual minimum: 20 to 25°F (−7 to −4°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Csb Warm-Summer Mediterranean

Warm, dry summers and mild, wet winters. Similar to hot-summer Mediterranean but cooler. Great for a wide range of vegetables and fruit trees with moderate water needs.

Köppen climate map

Temperature

30° 50° 70° 90°
42°
High: 47°F
Avg: 42°F
Low: 37°F
Jan
45°
High: 51°F
Avg: 45°F
Low: 39°F
Feb
48°
High: 56°F
Avg: 48°F
Low: 41°F
Mar
52°
High: 61°F
Avg: 52°F
Low: 44°F
Apr
59°
High: 68°F
Avg: 59°F
Low: 49°F
May
63°
High: 73°F
Avg: 63°F
Low: 53°F
Jun
69°
High: 80°F
Avg: 69°F
Low: 58°F
Jul
70°
High: 81°F
Avg: 70°F
Low: 59°F
Aug
65°
High: 75°F
Avg: 65°F
Low: 55°F
Sep
55°
High: 63°F
Avg: 55°F
Low: 48°F
Oct
47°
High: 52°F
Avg: 47°F
Low: 42°F
Nov
42°
High: 46°F
Avg: 42°F
Low: 37°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 2" 4" 6" 7.1"
6.4"
6.37"
Jan
5.4"
5.42"
Feb
5.9"
5.91"
Mar
4.6"
4.57"
Apr
4.0"
4.03"
May
3.3"
3.26"
Jun
1.5"
1.48"
Jul
1.5"
1.54"
Aug
4.1"
4.10"
Sep
5.4"
5.39"
Oct
6.7"
6.70"
Nov
7.1"
7.09"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9h8.5h
Jan: 7:33 AM – 4:27 PM · 8h 53m
Feb: 6:56 AM – 5:04 PM · 10h 09m
Mar: 6:11 AM – 5:49 PM · 11h 37m
Apr: 5:21 AM – 6:39 PM · 13h 18m
May: 4:39 AM – 7:21 PM · 14h 42m
Jun: 4:16 AM – 7:44 PM · 15h 28m
Jul: 4:25 AM – 7:35 PM · 15h 09m
Aug: 5:02 AM – 6:58 PM · 13h 56m
Sep: 5:51 AM – 6:09 PM · 12h 18m
Oct: 6:40 AM – 5:20 PM · 10h 41m
Nov: 7:23 AM – 4:37 PM · 9h 14m
Dec: 7:44 AM – 4:16 PM · 8h 32m
Daylight Longest: 15h 30m · Shortest: 8h 30m

Nearby Stations

Portland Intl AP, OR March 13 - November 19 Vancouver Pearson AP, WA March 29 - November 9 Nature Park-Beaverton, OR February 11 - December 5 Beaverton 2 Ssw, OR April 1 - November 6 Portland Wfo, OR March 13 - November 22 Vancouver 4 Nne, WA April 26 - October 18

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