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Chill hours in 58718

The short answer

58718 averages 1,063 chill hours per winter (6051,304 across 10 years) in USDA zone 4a.
58718 climate
Average chill hours1,063 (605–1,304 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 29 – May 19
First fall frosttypically October 6 – October 25

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 58718’s chill hours and zone:

How many chill hours does 58718 get?
58718 averages 1063 chill hours per winter, ranging from 605 to 1304 across the last 10 years.
What hardiness zone is 58718?
58718 is in USDA hardiness zone 4a.

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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