USDA Hardiness Zone 7b
Frost Dates for 97058 — The Dalles, Oregon
NOAA 1991–2020 normals from The Dalles, OR (150 ft), 1 miles northwest.
Updated
In The Dalles, the last spring frost (32°F) is around April 14 in half of years and has passed by May 1 in nine years out of ten. The first fall frost comes around October 23, as early as October 5 one year in ten, leaving a typical freeze-free season of 191 days (NOAA, The Dalles, OR).
- Last spring frost
- April 14
- First fall frost
- October 23
- Growing season
- 191 days
- Hardiness zone
- 7b
50% probability
50% probability
freeze-free, 50%
5 to 10°F (-15.0 to -12.2°C) coldest night
- First snow
- December 15
- Last snow
- January 28
- Winters with snow
- 81%
- Snow per year
- 5.5"
median, 1991–2020
median, 1991–2020
13 of 16 observed
NOAA normal
Frost risk by date in The Dalles
Half of springs at The Dalles, OR see their last 32°F night by April 14; only one in ten is past it by March 27, and one in ten still has one after May 1. Planting tender crops after April 21 leaves a 30% risk of a frost on them, after April 26 20%, and after May 1 10%. The 17 days between the even-odds date and the one-in-ten date is narrower than at 83% of the 103 Oregon stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 23 in half of years, as early as October 5 one year in ten, and holds off past November 9 one year in ten. A hard freeze of 28°F follows 13 days later, around November 5; in spring the one-in-ten date for 28°F is April 9, 22 days before the 32°F one. The freeze-free season lasts 191 days in a typical year, shorter than at 56% of the 103 Oregon stations; it reaches 215 days one year in ten and falls short of 166 one year in ten. On average 85 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 16 days longer, to about April 30, and return around October 8. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 78%.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 18 | Apr 22 | Apr 25 | Apr 28 | Apr 30 | May 2 | May 5 | May 8 | May 14 |
| 32°F | Mar 27 | Apr 1 | Apr 6 | Apr 9 | Apr 14 | Apr 18 | Apr 21 | Apr 26 | May 1 |
| 28°F | Feb 28 | Mar 7 | Mar 11 | Mar 15 | Mar 20 | Mar 25 | Mar 29 | Apr 2 | Apr 9 |
| 24°F | Jan 31 | Feb 12 | Feb 18 | Feb 23 | Feb 27 | Mar 2 | Mar 5 | Mar 10 | Mar 15 |
| 20°F95% of yrs | Dec 30 | Jan 8 | Jan 19 | Feb 1 | Feb 9 | Feb 16 | Feb 22 | Feb 27 | Mar 4 |
| 16°F78% of yrs | Dec 10 | Dec 25 | Jan 2 | Jan 10 | Jan 20 | Jan 31 | Feb 8 | Feb 17 | Feb 26 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 25 | Oct 1 | Oct 3 | Oct 5 | Oct 8 | Oct 12 | Oct 16 | Oct 20 | Oct 26 |
| 32°F | Oct 5 | Oct 11 | Oct 16 | Oct 19 | Oct 23 | Oct 27 | Oct 30 | Nov 3 | Nov 9 |
| 28°F | Oct 19 | Oct 25 | Oct 29 | Nov 1 | Nov 5 | Nov 9 | Nov 13 | Nov 19 | Nov 26 |
| 24°F | Oct 30 | Nov 5 | Nov 11 | Nov 16 | Nov 22 | Nov 26 | Dec 1 | Dec 9 | Dec 21 |
| 20°F95% of yrs | Nov 8 | Nov 17 | Nov 24 | Dec 1 | Dec 7 | Dec 15 | Dec 23 | Jan 1 | Jan 13 |
| 16°F78% of yrs | Nov 14 | Nov 28 | Dec 6 | Dec 12 | Dec 20 | Dec 27 | Jan 1 | Jan 12 | Jan 31 |
Freeze probabilities 1991–2020 at The Dalles, 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 97058 →Compare The Dalles with another place →
Weather by month in The Dalles
July is the warmest month at The Dalles, OR, averaging 88°F by day and 58°F at night; January is the coldest at 43°F and 29°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 79% of years and May still brings one in 11% of years.
Warmth for growing adds up to 2,973 growing degree days a year (base 50°F), more than at 89% of the 103 Oregon stations. 31% of them (929) have built up by the end of June, and July adds the most, 721. Precipitation totals 14.2 inches a year, most in December (2.9") and least in July (0.2"); May to September bring 13% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 43 | 29 | 2.5 | 100% | 18 | 1 |
| Feb | 49 | 30 | 1.6 | 100% | 17 | 3 |
| Mar | 57 | 34 | 1.3 | 100% | 11 | 20 |
| Apr | 65 | 39 | 1.0 | 79% | 4 | 101 |
| May | 73 | 47 | 0.8 | 11% | <1 | 320 |
| Jun | 79 | 53 | 0.4 | 0% | 0 | 486 |
| Jul | 88 | 58 | 0.2 | 0% | 0 | 721 |
| Aug | 89 | 57 | 0.2 | 0% | 0 | 713 |
| Sep | 81 | 49 | 0.3 | 4% | <1 | 452 |
| Oct | 67 | 40 | 1.1 | 72% | 4 | 146 |
| Nov | 52 | 33 | 1.9 | 99% | 12 | 11 |
| Dec | 43 | 29 | 2.9 | 100% | 19 | 1 |
Monthly normals 1991–2020 at The Dalles, OR (150 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, The Dalles Municipal Airport, WA, 2 miles northeast of The Dalles, has a last frost 3 days earlier (April 11), a first frost 3 days later (October 26), a season 6 days longer.
When it snows in The Dalles, Oregon
The first measurable snow (0.1 inch or more) in The Dalles usually arrives around December 15, and the last of the season around January 28. Those are the middle dates across the winters of 1991–2020 at The Dalles, OR, 1.1 miles away: half of years saw snow earlier, half later. Snow fell in 81% of those winters. The last 32°F night of spring typically comes 76 days after the last snow.
Planting calendar for 97058
| When | What to do |
|---|---|
| February 3 – February 17 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 17 – March 3 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 17 – March 31 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 14 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 31 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 9 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 23 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 97058 is 1 mile from The Dalles, OR, which stands at 150 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 97058 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°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.