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Chill hours in S6K

The short answer

S6K averages 1,110 chill hours per winter (7261,424 across 10 years) in USDA zone 4a.
S6K climate
Average chill hours1,110 (726–1,424 across 10 winters)
USDA hardiness zone4a (NRCan zone 3b)
Last spring frosttypically May 1 – May 19
First fall frosttypically September 28 – October 14

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023 / NRCan 1981–2010. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against S6K’s chill hours and zone:

How many chill hours does S6K get?
S6K averages 1110 chill hours per winter, ranging from 726 to 1424 across the last 10 years.
What hardiness zone is S6K?
S6K is in USDA hardiness zone 4a.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] Natural Resources Canada. Plant Hardiness Zones of Canada — accessed July 2026