How many chill hours does 99707 get?

99707 averages 680 chill hours per winter, ranging from 416 to 1134 across the last 10 years.

What hardiness zone is 99707?

99707 is in USDA hardiness zone 3b.

Location almanac

The short answer

99707 averages 680 chill hours per winter (416–1,134 across 10 years) in USDA zone 3b.

99707 climate
Average chill hours	680 (416–1,134 across 10 winters)
USDA hardiness zone	3b
Last spring frost	typically May 7 – May 29
First fall frost	typically September 9 – September 29

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 99707’s chill hours and zone:

Chill and zone requirements are comfortably met in 99707.

Show 16 more good fit varieties

Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 99707 get?: 99707 averages 680 chill hours per winter, ranging from 416 to 1134 across the last 10 years.
What hardiness zone is 99707?: 99707 is in USDA hardiness zone 3b.

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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