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Chill hours in S7C

The short answer

S7C averages 910 chill hours per winter (5321,319 across 10 years) in USDA zone 3b.
S7C climate
Average chill hours910 (532–1,319 across 10 winters)
USDA hardiness zone3b (NRCan zone 3a)
Last spring frosttypically April 30 – May 21
First fall frosttypically September 22 – October 12

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 S7C’s chill hours and zone:

How many chill hours does S7C get?
S7C averages 910 chill hours per winter, ranging from 532 to 1319 across the last 10 years.
What hardiness zone is S7C?
S7C is in USDA hardiness zone 3b.

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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