How many chill hours does 99609 get?

99609 averages 1257 chill hours per winter, ranging from 786 to 1520 across the last 10 years.

What hardiness zone is 99609?

99609 is in USDA hardiness zone 4a.

Location almanac

The short answer

99609 averages 1,257 chill hours per winter (786–1,520 across 10 years) in USDA zone 4a.

99609 climate
Average chill hours	1,257 (786–1,520 across 10 winters)
USDA hardiness zone	4a
Last spring frost	typically April 28 – May 28
First fall frost	typically September 24 – October 16

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 99609’s chill hours and zone:

Chill and zone requirements are comfortably met in 99609.

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How many chill hours does 99609 get?: 99609 averages 1257 chill hours per winter, ranging from 786 to 1520 across the last 10 years.
What hardiness zone is 99609?: 99609 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