How many chill hours does 97820 get?

97820 averages 1372 chill hours per winter, ranging from 699 to 1710 across the last 10 years.

What hardiness zone is 97820?

97820 is in USDA hardiness zone 6b.

Location almanac

The short answer

97820 averages 1,372 chill hours per winter (699–1,710 across 10 years) in USDA zone 6b.

97820 climate
Average chill hours	1,372 (699–1,710 across 10 winters)
USDA hardiness zone	6b
Last spring frost	typically June 7 – June 20
First fall frost	typically September 5 – October 12

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 97820’s chill hours and zone:

Chill and zone requirements are comfortably met in 97820.

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How many chill hours does 97820 get?: 97820 averages 1372 chill hours per winter, ranging from 699 to 1710 across the last 10 years.
What hardiness zone is 97820?: 97820 is in USDA hardiness zone 6b.

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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