USDA Hardiness Zone 9a
Frost Dates for 97112 — Cloverdale, Oregon
NOAA 1991–2020 normals from Cloverdale, OR (12 ft), 4 miles south.
Updated
In Cloverdale, the last spring frost (32°F) is around March 17 in half of years and has passed by April 15 in nine years out of ten. The first fall frost comes around November 22, as early as October 26 one year in ten, leaving a typical freeze-free season of 251 days (NOAA, Cloverdale, OR).
- Last spring frost
- March 17
- First fall frost
- November 22
- Growing season
- 251 days
- Hardiness zone
- 9a
50% probability
50% probability
freeze-free, 50%
20 to 25°F (-6.7 to -3.9°C) coldest night
- First snow
- Rare
- Last snow
- Rare
- Winters with snow
- 33%
- Snow per year
- 1"
median, 1991–2020
median, 1991–2020
9 of 27 observed
NOAA normal
Frost risk by date in Cloverdale
Half of springs at Cloverdale, OR see their last 32°F night by March 17; only one in ten is past it by February 9, and one in ten still has one after April 15. Planting tender crops after March 31 leaves a 30% risk of a frost on them, after April 5 20%, and after April 15 10%. The 29 days between the even-odds date and the one-in-ten date is wider than at 82% 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 22 in half of years, as early as October 26 one year in ten, and holds off past December 31 one year in ten. A hard freeze of 28°F follows 21 days later, around December 13; in spring the one-in-ten date for 28°F is February 28, 46 days before the 32°F one. The freeze-free season lasts 251 days in a typical year, longer than at 87% of the 103 Oregon stations; it reaches 304 days one year in ten and falls short of 206 one year in ten. On average 17 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 41 days longer, to about April 27, and return around October 26. A 24°F night is unusual: 28% of winters had one.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Mar 31 | Apr 9 | Apr 16 | Apr 22 | Apr 27 | Apr 29 | May 3 | May 8 | May 15 |
| 32°F | Feb 9 | Feb 22 | Feb 28 | Mar 8 | Mar 17 | Mar 25 | Mar 31 | Apr 5 | Apr 15 |
| 28°F74% of yrs | Dec 3 | Dec 14 | Dec 31 | Jan 12 | Jan 25 | Feb 4 | Feb 14 | Feb 21 | Feb 28 |
| 24°F28% of yrs | too rare for a date | ||||||||
| 20°F6% of yrs | too rare for a date | ||||||||
| 16°F0% of yrs | too rare for a date | ||||||||
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 2 | Oct 10 | Oct 17 | Oct 22 | Oct 26 | Oct 30 | Nov 4 | Nov 12 | Nov 21 |
| 32°F | Oct 26 | Nov 1 | Nov 9 | Nov 15 | Nov 22 | Nov 29 | Dec 5 | Dec 12 | Dec 31 |
| 28°F74% of yrs | Nov 8 | Nov 21 | Dec 1 | Dec 6 | Dec 13 | Dec 27 | Jan 6 | Jan 26 | Feb 14 |
| 24°F28% of yrs | too rare for a date | ||||||||
| 20°F6% of yrs | too rare for a date | ||||||||
| 16°F0% of yrs | too rare for a date | ||||||||
Freeze probabilities 1991–2020 at Cloverdale, 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 97112 →Compare Cloverdale with another place →
Weather by month in Cloverdale
August is the warmest month at Cloverdale, OR, averaging 70°F by day and 52°F at night; December is the coldest at 51°F and 40°F. From May to September the chance of a 32°F night stays under 10% each month. In spring, February still brings one in 76% of years and March still brings one in 55% of years and April still brings one in 25% of years.
Warmth for growing adds up to 1,590 growing degree days a year (base 50°F), fewer than at 85% of the 103 Oregon stations. 28% of them (441) have built up by the end of June, and August adds the most, 340. Precipitation totals 79.7 inches a year, most in December (12.7") and least in July (0.8"); May to September bring 15% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 52 | 40 | 11.4 | 66% | 4 | 16 |
| Feb | 53 | 40 | 8.7 | 76% | 4 | 18 |
| Mar | 55 | 40 | 8.8 | 55% | 2 | 27 |
| Apr | 57 | 42 | 6.8 | 25% | 1 | 42 |
| May | 62 | 46 | 4.3 | 2% | 0 | 125 |
| Jun | 65 | 49 | 3.0 | 0% | 0 | 213 |
| Jul | 69 | 52 | 0.8 | 0% | 0 | 325 |
| Aug | 70 | 52 | 1.1 | 0% | 0 | 340 |
| Sep | 69 | 50 | 3.0 | 0% | 0 | 281 |
| Oct | 63 | 46 | 6.9 | 18% | <1 | 145 |
| Nov | 56 | 42 | 12.2 | 53% | 2 | 45 |
| Dec | 51 | 40 | 12.7 | 73% | 4 | 13 |
Monthly normals 1991–2020 at Cloverdale, OR (12 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, Tillamook, OR, 14 miles north of Cloverdale, has a last frost 36 days later (April 22), a first frost 32 days earlier (October 21), a season 68 days shorter.
When it snows in Cloverdale, Oregon
Measurable snow is rare here: only 9 of 27 winters from 1991 to 2020 recorded 0.1 inch or more at Cloverdale, OR, 3.6 miles away, so there is no typical first-snow date to plan around.
Planting calendar for 97112
| When | What to do |
|---|---|
| January 6 – January 20 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| January 20 – February 3 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| February 17 – March 3 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| March 17 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 30 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by November 8 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 22 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 97112 is 4 miles from Cloverdale, OR, which stands at 12 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 97112 in zone 9a, the band where the coldest night of the year averaged 20 to 25°F (-6.7 to -3.9°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.