How many chill hours does 58621 get?

58621 averages 1283 chill hours per winter, ranging from 787 to 1468 across the last 10 years.

What hardiness zone is 58621?

58621 is in USDA hardiness zone 4a.

Location almanac

The short answer

58621 averages 1,283 chill hours per winter (787–1,468 across 10 years) in USDA zone 4a.

58621 climate
Average chill hours	1,283 (787–1,468 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically April 28 – May 19
First fall frost	typically September 28 – October 28

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 58621’s chill hours and zone:

Chill and zone requirements are comfortably met in 58621.

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How many chill hours does 58621 get?: 58621 averages 1283 chill hours per winter, ranging from 787 to 1468 across the last 10 years.
What hardiness zone is 58621?: 58621 is in USDA hardiness zone 4a.

Growing fruit trees in 58621? Get a care calendar anchored to this exact climate, with email reminders.

[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