How many chill hours does 99604 get?

99604 averages 1284 chill hours per winter, ranging from 827 to 1547 across the last 10 years.

What hardiness zone is 99604?

99604 is in USDA hardiness zone 4b.

Location almanac

The short answer

99604 averages 1,284 chill hours per winter (827–1,547 across 10 years) in USDA zone 4b.

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 99604’s chill hours and zone:

Chill and zone requirements are comfortably met in 99604.

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How many chill hours does 99604 get?: 99604 averages 1284 chill hours per winter, ranging from 827 to 1547 across the last 10 years.
What hardiness zone is 99604?: 99604 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