Frost Dates for Portland Intl AP, OR

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. March 13
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. November 19
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 21
First Fall Frost November 11

Hard Freeze (28°F / -2°C)

Last Spring Hard Freeze February 16
First Fall Hard Freeze December 5
45.59°N, -122.60°W © OpenStreetMap

Growing Season

251 Days March 13 to November 19

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

Learn more

Temperature

30° 50° 70° 90°
42°
High: 48°
Avg: 42°
Low: 36°
Jan
44°
High: 52°
Avg: 44°
Low: 37°
Feb
48°
High: 57°
Avg: 48°
Low: 40°
Mar
53°
High: 62°
Avg: 53°
Low: 44°
Apr
59°
High: 69°
Avg: 59°
Low: 49°
May
64°
High: 74°
Avg: 64°
Low: 54°
Jun
70°
High: 82°
Avg: 70°
Low: 59°
Jul
71°
High: 82°
Avg: 71°
Low: 59°
Aug
65°
High: 77°
Avg: 65°
Low: 54°
Sep
56°
High: 64°
Avg: 56°
Low: 47°
Oct
47°
High: 54°
Avg: 47°
Low: 41°
Nov
42°
High: 47°
Avg: 42°
Low: 36°
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 2" 4" 5.7"
5.4"
5.39"
Jan
4.0"
4.02"
Feb
4.2"
4.18"
Mar
3.3"
3.25"
Apr
3.4"
3.42"
May
2.8"
2.81"
Jun
1.9"
1.89"
Jul
2.3"
2.33"
Aug
3.2"
3.17"
Sep
4.3"
4.25"
Oct
5.2"
5.17"
Nov
5.7"
5.71"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h12h13h15h15h15h14h12h11h9h9h
Jan: 7:34 AM – 4:26 PM · 8h 53m
Feb: 6:56 AM – 5:04 PM · 10h 08m
Mar: 6:12 AM – 5:48 PM · 11h 37m
Apr: 5:21 AM – 6:39 PM · 13h 18m
May: 4:39 AM – 7:21 PM · 14h 43m
Jun: 4:16 AM – 7:44 PM · 15h 29m
Jul: 4:25 AM – 7:35 PM · 15h 10m
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 40m
Nov: 7:23 AM – 4:37 PM · 9h 14m
Dec: 7:45 AM – 4:15 PM · 8h 31m
Daylight Longest: 15h 30m · Shortest: 8h 30m

Nearby Stations

Vancouver Pearson AP, WA March 29 - November 9 Portland Wfo, OR March 13 - November 22 Vancouver 4 Nne, WA April 26 - October 18 Portland Kgw-Tv, OR February 25 - December 1 Portland Troutdale AP, OR March 16 - November 20 Troutdale, OR March 26 - November 17

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