How many chill hours does 99621 get?

99621 averages 1304 chill hours per winter, ranging from 827 to 1626 across the last 10 years.

What hardiness zone is 99621?

99621 is in USDA hardiness zone 4a.

Location almanac

The short answer

99621 averages 1,304 chill hours per winter (827–1,626 across 10 years) in USDA zone 4a.

99621 climate
Average chill hours	1,304 (827–1,626 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 4 – May 18
First fall frost	typically September 18 – October 11

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 99621’s chill hours and zone:

Chill and zone requirements are comfortably met in 99621.

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How many chill hours does 99621 get?: 99621 averages 1304 chill hours per winter, ranging from 827 to 1626 across the last 10 years.
What hardiness zone is 99621?: 99621 is in USDA hardiness zone 4a.

Growing fruit trees in 99621? 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