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Chill hours in 58730

The short answer

58730 averages 1,094 chill hours per winter (6261,347 across 10 years) in USDA zone 4a.
58730 climate
Average chill hours1,094 (626–1,347 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically April 24 – May 19
First fall frosttypically September 28 – October 20

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 58730’s chill hours and zone:

How many chill hours does 58730 get?
58730 averages 1094 chill hours per winter, ranging from 626 to 1347 across the last 10 years.
What hardiness zone is 58730?
58730 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