Skip to content
EveryOrchard
Menu

Location almanac

Chill hours in 58581

The short answer

58581 averages 1,061 chill hours per winter (4721,323 across 10 years) in USDA zone 4a.
58581 climate
Average chill hours1,061 (472–1,323 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 25 – May 20
First fall frosttypically October 7 – November 7

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 58581’s chill hours and zone:

How many chill hours does 58581 get?
58581 averages 1061 chill hours per winter, ranging from 472 to 1323 across the last 10 years.
What hardiness zone is 58581?
58581 is in USDA hardiness zone 4a.

Growing fruit trees in 58581? Get a care calendar anchored to this exact climate, with email reminders.

Start My Orchard

Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026