USDA Hardiness Zone 9b
Frost Dates for 97415 — Brookings, Oregon
NOAA 1991–2020 normals from Brookings, OR (82 ft), 4 miles south.
Updated
A freeze (32°F) reaches Brookings in 61% of winters. When it does, the first fall frost comes around December 27 and the last spring frost around January 31; after March 21 the chance of another is under 6%.
- Last spring frost
- January 31
- First fall frost
- December 27
- Winters with a freeze
- 61%
- Hardiness zone
- 9b
50%, in freezing years
50%, in freezing years
32°F or below, 1991–2020
25 to 30°F (-3.9 to -1.1°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 0%
- Snow per year
- 0"
median, 1991–2020
median, 1991–2020
0 of 20 observed
NOAA normal
Frost risk by date in Brookings
In the 61% of winters that bring a 32°F night, half of springs at Brookings, OR see their last 32°F night by January 31; only one in ten is past it by December 9, and one in ten still has one after March 21. Counting the winters with no freeze at all, the risk of a 32°F night after March 21 is under 6% and after January 31 30%. The 49 days between the even-odds date and the one-in-ten date is the widest of the 103 Oregon stations behind this site's ZIP pages, so a fixed calendar date is a gamble here.
In fall the first 32°F night comes by December 27 in half of years, as early as November 26 one year in ten, and holds off past February 27 one year in ten. A hard freeze of 28°F is less common: it came in 14% of winters. The freeze-free season lasts 349 days in a typical year, the longest of the 103 Oregon stations; it reaches 365 days one year in ten and falls short of 291 one year in ten. On average 5 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 51 days longer, to about March 23, and return around December 7. A 24°F night is unusual: 2% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F99% of yrs | Jan 31 | Feb 22 | Mar 5 | Mar 16 | Mar 23 | Mar 30 | Apr 4 | Apr 13 | Apr 26 |
| 32°F61% of yrs | Dec 9 | Dec 22 | Jan 1 | Jan 18 | Jan 31 | Feb 12 | Feb 23 | Mar 1 | Mar 21 |
| 28°F14% of yrs | too rare for a date | ||||||||
| 24°F2% of yrs | too rare for a date | ||||||||
| 20°F0% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F99% of yrs | Nov 14 | Nov 23 | Nov 28 | Dec 2 | Dec 7 | Dec 12 | Dec 19 | Jan 1 | Jan 30 |
| 32°F61% of yrs | Nov 26 | Dec 3 | Dec 10 | Dec 18 | Dec 27 | Jan 6 | Jan 25 | Feb 10 | Feb 27 |
| 28°F14% of yrs | too rare for a date | ||||||||
| 24°F2% of yrs | too rare for a date | ||||||||
| 20°F0% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Brookings, OR, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 97415 →Compare Brookings with another place →
Weather by month in Brookings
August is the warmest month at Brookings, OR, averaging 66°F by day and 54°F at night; December is the coldest at 53°F and 43°F. From April to November the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 21% of years and March still brings one in 11% of years.
Warmth for growing adds up to 1,796 growing degree days a year (base 50°F), fewer than at 73% of the 103 Oregon stations. 33% of them (586) have built up by the end of June, and August adds the most, 313. Precipitation totals 77.8 inches a year, most in December (14.1") and least in July (0.4"); May to September bring 10% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 54 | 44 | 12.6 | 19% | 1 | 36 |
| Feb | 55 | 43 | 9.9 | 21% | 1 | 38 |
| Mar | 55 | 43 | 9.9 | 11% | 1 | 43 |
| Apr | 58 | 45 | 7.1 | 3% | <1 | 71 |
| May | 62 | 48 | 3.4 | 0% | 0 | 155 |
| Jun | 65 | 51 | 2.1 | 0% | 0 | 243 |
| Jul | 67 | 53 | 0.4 | 0% | 0 | 310 |
| Aug | 66 | 54 | 0.7 | 0% | 0 | 313 |
| Sep | 67 | 52 | 1.5 | 0% | 0 | 288 |
| Oct | 63 | 49 | 5.0 | 0% | 0 | 190 |
| Nov | 57 | 46 | 11.1 | 10% | 1 | 80 |
| Dec | 53 | 43 | 14.1 | 26% | 2 | 29 |
Monthly normals 1991–2020 at Brookings, OR (82 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Brookings 2 SE, OR, 5 miles south of Brookings, has the same 50% last-frost date, the same first-frost date, a season 15 days shorter.
When it snows in Brookings, Oregon
Measurable snow is rare here: only 0 of 20 winters from 1991 to 2020 recorded 0.1 inch or more at Crescent City 3 NNW, CA, 21.1 miles away, so there is no typical first-snow date to plan around.
Where these figures come from
ZIP 97415 is 4 miles from Brookings, OR, which stands at 82 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 97415 in zone 9b, the band where the coldest night of the year averaged 25 to 30°F (-3.9 to -1.1°C) over 1991–2020; a zone describes winter lows, not frost dates.
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.