How many chill hours does 99633 get?

99633 averages 1799 chill hours per winter, ranging from 1053 to 2562 across the last 10 years.

What hardiness zone is 99633?

99633 is in USDA hardiness zone 4b.

Location almanac

The short answer

99633 averages 1,799 chill hours per winter (1,053–2,562 across 10 years) in USDA zone 4b.

99633 climate
Average chill hours	1,799 (1,053–2,562 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically May 2 – May 15
First fall frost	typically September 22 – 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 99633’s chill hours and zone:

Chill and zone requirements are comfortably met in 99633.

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How many chill hours does 99633 get?: 99633 averages 1799 chill hours per winter, ranging from 1053 to 2562 across the last 10 years.
What hardiness zone is 99633?: 99633 is in USDA hardiness zone 4b.

Growing fruit trees in 99633? 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