Harman US

Frost Dates for Brookings, OR

Last spring frost
Jan 31
First fall frost
Dec 27
Growing season
334 days
Hardiness zone
9b

In an average year around Brookings, OR, the last spring frost (32°F) is about Jan 31 and the first fall frost is about Dec 27, giving roughly a 334-day growing season. To be safe most years, wait until Dec 14 before setting out tender plants.

Last spring frost

Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.

Last spring frost - Brookings, OR
Frost intensity Early (10%) Average (50%) Late (90%)
Light (36°F) Apr 29 Mar 30 Feb 14
Freeze (32°F) Mar 20 Jan 31 Dec 14
Hard (28°F) Feb 18 Jan 1 Dec 5
Show full probability table (all thresholds & percentiles)
°F 10% 20% 30% 40% 50% 60% 70% 80% 90%
36°F Apr 29 Apr 20 Apr 12 Apr 6 Mar 30 Mar 25 Mar 16 Mar 2 Feb 14
32°F Mar 20 Mar 3 Feb 25 Feb 15 Jan 31 Jan 15 Jan 5 Dec 29 Dec 14
28°F Feb 18 Jan 27 Jan 15 Jan 7 Jan 1 Dec 28 Dec 22 Dec 14 Dec 5

First fall frost

Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.

First fall frost - Brookings, OR
Frost intensity Early (10%) Average (50%) Late (90%)
Light (36°F) Nov 6 Nov 29 Dec 28
Freeze (32°F) Nov 24 Dec 27 Feb 19
Hard (28°F) Dec 1 Dec 29 Feb 12
Show full probability table (all thresholds & percentiles)
°F 10% 20% 30% 40% 50% 60% 70% 80% 90%
36°F Nov 6 Nov 12 Nov 18 Nov 24 Nov 29 Dec 3 Dec 10 Dec 17 Dec 28
32°F Nov 24 Dec 3 Dec 12 Dec 20 Dec 27 Jan 1 Jan 9 Jan 21 Feb 19
28°F Dec 1 Dec 10 Dec 18 Dec 24 Dec 29 Jan 3 Jan 11 Jan 19 Feb 12

Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.

Where this data comes from

These dates are computed from the nearest official weather station with long-term records: Brookings 2 Se, Or, about 9.4 miles away@if(!empty($station['elevation_ft'])), at 50 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.

@endif
How we calculate these dates

Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.

Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.

Frequently asked questions

When is the last frost in Brookings, OR?

On average, the last spring frost (32°F) around Brookings, OR is about Jan 31. In cooler years it can run later, so for a safer bet many gardeners wait until Dec 14.

When is the first frost in the fall?

The first fall frost around Brookings, OR typically arrives about Dec 27. Count back by a crop's days to maturity to find the latest date you can plant it.

When can I plant tomatoes and other tender crops?

Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Jan 31 on average, or Dec 14 to be safe most years.

How long is the growing season here?

The frost-free growing season (between the last spring and first fall 32°F frost) is about 334 days in a typical year.

Are these dates a forecast for this year?

No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.

Local weather for 97415 Planting calendar → Oregon frost dates →

Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026