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Chill hours in G5X

The short answer

G5X averages 1,192 chill hours per winter (9761,586 across 10 years) in USDA zone 4b.
G5X climate
Average chill hours1,192 (976–1,586 across 10 winters)
USDA hardiness zone4b (NRCan zone 4a)
Last spring frosttypically May 7 – May 18
First fall frosttypically September 24 – October 25

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 G5X’s chill hours and zone:

How many chill hours does G5X get?
G5X averages 1192 chill hours per winter, ranging from 976 to 1586 across the last 10 years.
What hardiness zone is G5X?
G5X 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