How many chill hours does 99634 get?

99634 averages 1289 chill hours per winter, ranging from 805 to 1583 across the last 10 years.

What hardiness zone is 99634?

99634 is in USDA hardiness zone 4a.

Location almanac

The short answer

99634 averages 1,289 chill hours per winter (805–1,583 across 10 years) in USDA zone 4a.

99634 climate
Average chill hours	1,289 (805–1,583 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically May 4 – May 28
First fall frost	typically September 21 – October 8

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 99634’s chill hours and zone:

Chill and zone requirements are comfortably met in 99634.

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How many chill hours does 99634 get?: 99634 averages 1289 chill hours per winter, ranging from 805 to 1583 across the last 10 years.
What hardiness zone is 99634?: 99634 is in USDA hardiness zone 4a.

Growing fruit trees in 99634? 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