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Chill hours in G9C

The short answer

G9C averages 1,177 chill hours per winter (9591,654 across 10 years) in USDA zone 4b.
G9C climate
Average chill hours1,177 (959–1,654 across 10 winters)
USDA hardiness zone4b (NRCan zone 5a)
Last spring frosttypically April 28 – May 15
First fall frosttypically October 18 – November 3

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 G9C’s chill hours and zone:

How many chill hours does G9C get?
G9C averages 1177 chill hours per winter, ranging from 959 to 1654 across the last 10 years.
What hardiness zone is G9C?
G9C 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