USDA Hardiness Zone 8b
Frost Dates for 97007 — Beaverton, Oregon
NOAA 1991–2020 normals from Beaverton 2 SSW, OR (270 ft), 2 miles southeast.
Updated
In Beaverton, the last spring frost (32°F) is around April 1 in half of years and has passed by April 26 in nine years out of ten. The first fall frost comes around November 6, as early as October 19 one year in ten, leaving a typical freeze-free season of 222 days (NOAA, Beaverton 2 SSW, OR).
- Last spring frost
- April 1
- First fall frost
- November 6
- Growing season
- 222 days
- Hardiness zone
- 8b
50% probability
50% probability
freeze-free, 50%
15 to 20°F (-9.4 to -6.7°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 25%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
4 of 16 observed
NOAA normal
Frost risk by date in Beaverton
Half of springs at Beaverton 2 SSW, OR see their last 32°F night by April 1; only one in ten is past it by March 5, and one in ten still has one after April 26. Planting tender crops after April 11 leaves a 30% risk of a frost on them, after April 18 20%, and after April 26 10%. The 25 days between the even-odds date and the one-in-ten date is wider than at 68% 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 November 6 in half of years, as early as October 19 one year in ten, and holds off past December 1 one year in ten. A hard freeze of 28°F follows 24 days later, around November 30; in spring the one-in-ten date for 28°F is March 26, 31 days before the 32°F one. The freeze-free season lasts 222 days in a typical year, longer than at 66% of the 103 Oregon stations; it reaches 254 days one year in ten and falls short of 186 one year in ten. On average 42 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 27 days longer, to about April 28, and return around October 21. Nights of 24°F, cold enough to damage hardier plants, come in 84% of winters and 16°F in 17%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 11 | Apr 17 | Apr 22 | Apr 25 | Apr 28 | Apr 30 | May 4 | May 8 | May 16 |
| 32°F | Mar 5 | Mar 15 | Mar 22 | Mar 28 | Apr 1 | Apr 6 | Apr 11 | Apr 18 | Apr 26 |
| 28°F | Jan 23 | Feb 9 | Feb 17 | Feb 22 | Feb 26 | Mar 2 | Mar 8 | Mar 16 | Mar 26 |
| 24°F84% of yrs | Dec 15 | Dec 31 | Jan 12 | Jan 24 | Feb 1 | Feb 10 | Feb 16 | Feb 22 | Feb 28 |
| 20°F45% of yrs | too rare for a date | ||||||||
| 16°F17% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 4 | Oct 10 | Oct 14 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Oct 31 | Nov 7 |
| 32°F | Oct 19 | Oct 25 | Oct 29 | Nov 1 | Nov 6 | Nov 11 | Nov 17 | Nov 22 | Dec 1 |
| 28°F | Nov 6 | Nov 13 | Nov 20 | Nov 25 | Nov 30 | Dec 4 | Dec 9 | Dec 17 | Dec 27 |
| 24°F84% of yrs | Nov 18 | Nov 28 | Dec 5 | Dec 11 | Dec 19 | Dec 28 | Jan 5 | Jan 19 | Feb 3 |
| 20°F45% of yrs | too rare for a date | ||||||||
| 16°F17% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Beaverton 2 SSW, 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 97007 →Compare Beaverton with another place →
Weather by month in Beaverton
July is the warmest month at Beaverton 2 SSW, OR, averaging 82°F by day and 54°F at night; December is the coldest at 48°F and 34°F. A freezing night is all but certain in every month from December to February (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, March still brings one in 86% of years and April still brings one in 47% of years.
Warmth for growing adds up to 2,459 growing degree days a year (base 50°F), more than at 65% of the 103 Oregon stations. 31% of them (762) have built up by the end of June, and July adds the most, 566.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 49 | 34 | 99% | 11 | 3 |
| Feb | 53 | 35 | 97% | 8 | 7 |
| Mar | 58 | 37 | 86% | 5 | 35 |
| Apr | 64 | 40 | 47% | 1 | 92 |
| May | 70 | 46 | 5% | <1 | 251 |
| Jun | 75 | 50 | 1% | 0 | 374 |
| Jul | 82 | 54 | 0% | 0 | 566 |
| Aug | 82 | 54 | 0% | 0 | 556 |
| Sep | 77 | 50 | 1% | <1 | 404 |
| Oct | 65 | 43 | 35% | 1 | 148 |
| Nov | 54 | 38 | 82% | 6 | 22 |
| Dec | 48 | 34 | 100% | 9 | 2 |
Monthly normals 1991–2020 at Beaverton 2 SSW, OR (270 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, Nature Park-Beaverton, OR, 2 miles north of Beaverton, has a last frost 49 days earlier (February 11), a first frost 29 days later (December 5), a season 81 days longer.
When it snows in Beaverton, Oregon
Measurable snow is rare here: only 4 of 16 winters from 1991 to 2020 recorded 0.1 inch or more at Beaverton 2 SSW, OR, 2 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 97007
| When | What to do |
|---|---|
| January 21 – February 4 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 4 – February 18 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 4 – March 18 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 1 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 14 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 23 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 6 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 97007 is 2 miles from Beaverton 2 SSW, OR, which stands at 270 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 6 other ZIP codes share the station; its figures are presented in full for 97223 (Tigard). The 2023 USDA Plant Hardiness Zone Map lists ZIP 97007 in zone 8b, the band where the coldest night of the year averaged 15 to 20°F (-9.4 to -6.7°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.