How many chill hours does 58620 get?

58620 averages 1260 chill hours per winter, ranging from 756 to 1449 across the last 10 years.

What hardiness zone is 58620?

58620 is in USDA hardiness zone 4b.

Location almanac

The short answer

58620 averages 1,260 chill hours per winter (756–1,449 across 10 years) in USDA zone 4b.

58620 climate
Average chill hours	1,260 (756–1,449 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically April 28 – May 20
First fall frost	typically September 28 – October 14

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 58620’s chill hours and zone:

Chill and zone requirements are comfortably met in 58620.

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How many chill hours does 58620 get?: 58620 averages 1260 chill hours per winter, ranging from 756 to 1449 across the last 10 years.
What hardiness zone is 58620?: 58620 is in USDA hardiness zone 4b.

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