USDA Hardiness Zone 7a
Frost Dates for 98932 — Granger, Washington
NOAA 1991–2020 normals from Sunnyside #2, WA (805 ft), 7 miles east.
Updated
In Granger, the last spring frost (32°F) is around April 30 in half of years and has passed by May 13 in nine years out of ten. The first fall frost comes around October 8, as early as September 26 one year in ten, leaving a typical freeze-free season of 160 days (NOAA, Sunnyside #2, WA).
- Last spring frost
- April 30
- First fall frost
- October 8
- Growing season
- 160 days
- Hardiness zone
- 7a
50% probability
50% probability
freeze-free, 50%
0 to 5°F (-17.8 to -15.0°C) coldest night
- First snow
- December 14
- Last snow
- January 21
- Winters with snow
- 94%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
17 of 18 observed
NOAA normal
Frost risk by date in Granger
Half of springs at Sunnyside #2, WA see their last 32°F night by April 30; only one in ten is past it by April 19, and one in ten still has one after May 13. Planting tender crops after May 5 leaves a 30% risk of a frost on them, after May 9 20%, and after May 13 10%. The 13 days between the even-odds date and the one-in-ten date is the narrowest of the 113 Washington stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 8 in half of years, as early as September 26 one year in ten, and holds off past October 22 one year in ten. A hard freeze of 28°F follows 14 days later, around October 22; in spring the one-in-ten date for 28°F is May 1, 12 days before the 32°F one. The freeze-free season lasts 160 days in a typical year, shorter than at 80% of the 113 Washington stations; it reaches 182 days one year in ten and falls short of 141 one year in ten. On average 143 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 15 days longer, to about May 15, and return around September 26. Severe cold of 16°F or below comes in 98% of winters, usually between November 30 and February 16.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | May 2 | May 7 | May 9 | May 12 | May 15 | May 18 | May 21 | May 25 | Jun 1 |
| 32°F | Apr 19 | Apr 23 | Apr 26 | Apr 28 | Apr 30 | May 3 | May 5 | May 9 | May 13 |
| 28°F | Mar 30 | Apr 4 | Apr 8 | Apr 12 | Apr 15 | Apr 19 | Apr 23 | Apr 27 | May 1 |
| 24°F | Mar 5 | Mar 11 | Mar 17 | Mar 21 | Mar 26 | Mar 30 | Apr 2 | Apr 7 | Apr 15 |
| 20°F | Feb 8 | Feb 19 | Feb 24 | Feb 28 | Mar 3 | Mar 7 | Mar 12 | Mar 18 | Mar 27 |
| 16°F98% of yrs | Jan 5 | Jan 18 | Feb 1 | Feb 9 | Feb 16 | Feb 21 | Feb 25 | Feb 28 | Mar 6 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 11 | Sep 16 | Sep 20 | Sep 23 | Sep 26 | Sep 29 | Oct 1 | Oct 5 | Oct 9 |
| 32°F | Sep 26 | Sep 30 | Oct 3 | Oct 5 | Oct 8 | Oct 11 | Oct 14 | Oct 18 | Oct 22 |
| 28°F | Oct 6 | Oct 12 | Oct 16 | Oct 19 | Oct 22 | Oct 25 | Oct 27 | Nov 1 | Nov 6 |
| 24°F | Oct 19 | Oct 23 | Oct 27 | Oct 30 | Nov 1 | Nov 6 | Nov 10 | Nov 14 | Nov 21 |
| 20°F | Oct 27 | Nov 1 | Nov 7 | Nov 11 | Nov 16 | Nov 20 | Nov 25 | Dec 1 | Dec 8 |
| 16°F98% of yrs | Nov 5 | Nov 14 | Nov 21 | Nov 25 | Nov 30 | Dec 5 | Dec 12 | Dec 21 | Jan 3 |
Freeze probabilities 1991–2020 at Sunnyside #2, WA, 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 98932 →Compare Granger with another place →
Compared with the next station
The nearest other station, Sunnyside, WA, 8 miles east of Granger, has a last frost 1 day later (May 1), a first frost 2 days earlier (October 6), a season 3 days shorter.
When it snows in Granger, Washington
The first measurable snow (0.1 inch or more) in Granger usually arrives around December 14, and the last of the season around January 21. Those are the middle dates across the winters of 1991–2020 at Sunnyside, WA, 8.4 miles away: half of years saw snow earlier, half later. Snow fell in 94% of those winters. The last 32°F night of spring typically comes 99 days after the last snow.
Planting calendar for 98932
| When | What to do |
|---|---|
| February 19 – March 5 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 5 – March 19 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| April 2 – April 16 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 30 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 16 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by September 24 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 8 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 98932 is 7 miles from Sunnyside #2, WA, which stands at 805 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 98932 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across Washington →
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.