Frost Dates for 98604 — Battle Ground, Washington

Half of springs at Battle Ground, WA see their last 32°F night by April 26; only one in ten is past it by April 5, and one in ten still has one after May 12. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 5 20%, and after May 12 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 74% of the 113 Washington stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 16 in half of years, as early as September 29 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 20 days later, around November 5; in spring the one-in-ten date for 28°F is April 23, 19 days before the 32°F one. The freeze-free season lasts 174 days in a typical year, shorter than at 66% of the 113 Washington stations; it reaches 203 days one year in ten and falls short of 148 one year in ten. On average 70 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 17 days longer, to about May 13, and return around September 30. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 49%.

August is the warmest month at Battle Ground, WA, averaging 80°F by day and 50°F at night; December is the coldest at 45°F and 32°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 32% of years.

Warmth for growing adds up to 1,839 growing degree days a year (base 50°F), fewer than at 64% of the 113 Washington stations. 28% of them (517) have built up by the end of June, and August adds the most, 462. Precipitation totals 52.3 inches a year, most in December (8.0") and least in July (0.6"); May to September bring 18% of it.

The nearest other station, Vancouver 4 NNE, WA, 10 miles southwest of Battle Ground, has the same 50% last-frost date, a first frost 2 days later (October 18), a season 3 days longer.

The first measurable snow (0.1 inch or more) in Battle Ground usually arrives around December 21, and the last of the season around February 9. Those are the middle dates across the winters of 1991–2020 at Battle Ground, WA, 1.5 miles away: half of years saw snow earlier, half later. Snow fell in 73% of those winters. The last 32°F night of spring typically comes 76 days after the last snow.

ZIP 98604 is 2 miles from Battle Ground, WA, which stands at 284 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 98604 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.