How many chill hours does 58640 get?

58640 averages 1107 chill hours per winter, ranging from 614 to 1292 across the last 10 years.

What hardiness zone is 58640?

58640 is in USDA hardiness zone 4a.

Location almanac

The short answer

58640 averages 1,107 chill hours per winter (614–1,292 across 10 years) in USDA zone 4a.

58640 climate
Average chill hours	1,107 (614–1,292 across 10 winters)
USDA hardiness zone	4a
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 58640’s chill hours and zone:

Chill and zone requirements are comfortably met in 58640.

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How many chill hours does 58640 get?: 58640 averages 1107 chill hours per winter, ranging from 614 to 1292 across the last 10 years.
What hardiness zone is 58640?: 58640 is in USDA hardiness zone 4a.

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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