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Chill hours in S6H

The short answer

S6H averages 1,129 chill hours per winter (7491,412 across 10 years) in USDA zone 4b.
S6H climate
Average chill hours1,129 (749–1,412 across 10 winters)
USDA hardiness zone4b (NRCan zone 3b)
Last spring frosttypically May 1 – May 19
First fall frosttypically September 21 – 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 S6H’s chill hours and zone:

How many chill hours does S6H get?
S6H averages 1129 chill hours per winter, ranging from 749 to 1412 across the last 10 years.
What hardiness zone is S6H?
S6H is in USDA hardiness zone 4b.

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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