USDA Hardiness Zone 8b
Frost Dates for 97022 — Eagle Creek, Oregon
NOAA 1991–2020 normals from Estacada 2 SE, OR (514 ft), 6 miles south.
Updated
In Eagle Creek, the last spring frost (32°F) is around March 27 in half of years and has passed by April 23 in nine years out of ten. The first fall frost comes around November 14, as early as October 23 one year in ten, leaving a typical freeze-free season of 230 days (NOAA, Estacada 2 SE, OR).
- Last spring frost
- March 27
- First fall frost
- November 14
- Growing season
- 230 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
- 42%
- Snow per year
- 1.1"
median, 1991–2020
median, 1991–2020
11 of 26 observed
NOAA normal
Frost risk by date in Eagle Creek
Half of springs at Estacada 2 SE, OR see their last 32°F night by March 27; only one in ten is past it by March 2, and one in ten still has one after April 23. Planting tender crops after April 5 leaves a 30% risk of a frost on them, after April 14 20%, and after April 23 10%. The 27 days between the even-odds date and the one-in-ten date is wider than at 75% 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 14 in half of years, as early as October 23 one year in ten, and holds off past December 7 one year in ten. A hard freeze of 28°F follows 19 days later, around December 3; in spring the one-in-ten date for 28°F is March 20, 34 days before the 32°F one. The freeze-free season lasts 230 days in a typical year, longer than at 73% of the 103 Oregon stations; it reaches 263 days one year in ten and falls short of 198 one year in ten. On average 40 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 29 days longer, to about April 25, and return around October 25. Nights of 24°F, cold enough to damage hardier plants, come in 78% of winters and 16°F in 11%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 3 | Apr 11 | Apr 16 | Apr 21 | Apr 25 | Apr 29 | May 2 | May 5 | May 11 |
| 32°F | Mar 2 | Mar 11 | Mar 17 | Mar 23 | Mar 27 | Apr 1 | Apr 5 | Apr 14 | Apr 23 |
| 28°F99% of yrs | Jan 15 | Feb 2 | Feb 11 | Feb 17 | Feb 22 | Feb 26 | Mar 1 | Mar 9 | Mar 20 |
| 24°F78% of yrs | Dec 12 | Dec 24 | Jan 2 | Jan 11 | Jan 21 | Jan 31 | Feb 7 | Feb 14 | Feb 22 |
| 20°F35% of yrs | too rare for a date | ||||||||
| 16°F11% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 8 | Oct 15 | Oct 19 | Oct 22 | Oct 25 | Oct 28 | Nov 1 | Nov 6 | Nov 14 |
| 32°F | Oct 23 | Oct 30 | Nov 4 | Nov 9 | Nov 14 | Nov 18 | Nov 24 | Nov 29 | Dec 7 |
| 28°F99% of yrs | Nov 9 | Nov 16 | Nov 23 | Nov 28 | Dec 3 | Dec 7 | Dec 15 | Dec 23 | Jan 2 |
| 24°F78% of yrs | Nov 21 | Nov 30 | Dec 7 | Dec 12 | Dec 19 | Dec 26 | Jan 1 | Jan 10 | Feb 1 |
| 20°F35% of yrs | too rare for a date | ||||||||
| 16°F11% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Estacada 2 SE, 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 97022 →Compare Eagle Creek with another place →
Weather by month in Eagle Creek
August is the warmest month at Estacada 2 SE, OR, averaging 83°F by day and 54°F at night; December is the coldest at 48°F and 35°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 39% of years.
Warmth for growing adds up to 2,472 growing degree days a year (base 50°F), more than at 67% of the 103 Oregon stations. 30% of them (741) have built up by the end of June, and August adds the most, 569. Precipitation totals 57.9 inches a year, most in December (8.4") and least in July (0.6"); May to September bring 17% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 49 | 35 | 7.5 | 98% | 10 | 5 |
| Feb | 53 | 36 | 5.9 | 95% | 8 | 11 |
| Mar | 57 | 38 | 6.9 | 86% | 4 | 36 |
| Apr | 62 | 41 | 5.5 | 39% | 1 | 91 |
| May | 69 | 46 | 3.9 | 4% | 0 | 239 |
| Jun | 73 | 51 | 2.6 | 0% | 0 | 360 |
| Jul | 82 | 54 | 0.6 | 0% | 0 | 556 |
| Aug | 83 | 54 | 0.8 | 0% | 0 | 569 |
| Sep | 77 | 50 | 2.2 | 0% | 0 | 407 |
| Oct | 65 | 45 | 5.5 | 22% | 1 | 165 |
| Nov | 54 | 39 | 8.1 | 76% | 5 | 29 |
| Dec | 48 | 35 | 8.4 | 98% | 10 | 5 |
Monthly normals 1991–2020 at Estacada 2 SE, OR (514 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, Headworks Portland Wtr B, OR, 11 miles northeast of Eagle Creek and 234 feet higher, has the same 50% last-frost date, a first frost 4 days later (November 18), a season 9 days longer.
When it snows in Eagle Creek, Oregon
Measurable snow is rare here: only 11 of 26 winters from 1991 to 2020 recorded 0.1 inch or more at Estacada 2 SE, OR, 5.6 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 97022
| When | What to do |
|---|---|
| January 16 – January 30 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 30 – February 13 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 27 – March 13 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 27 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 22 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 31 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 14 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 97022 is 6 miles from Estacada 2 SE, OR, which stands at 514 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 97023 (Estacada). The 2023 USDA Plant Hardiness Zone Map lists ZIP 97022 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.