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Chill hours in G3N

The short answer

G3N averages 1,100 chill hours per winter (8311,511 across 10 years) in USDA zone 4b.
G3N climate
Average chill hours1,100 (831–1,511 across 10 winters)
USDA hardiness zone4b (NRCan zone 4b)
Last spring frosttypically April 28 – May 17
First fall frosttypically October 13 – October 28

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 G3N’s chill hours and zone:

How many chill hours does G3N get?
G3N averages 1100 chill hours per winter, ranging from 831 to 1511 across the last 10 years.
What hardiness zone is G3N?
G3N 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