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Chill hours in G8A

The short answer

G8A averages 972 chill hours per winter (7301,327 across 10 years) in USDA zone 4b.
G8A climate
Average chill hours972 (730–1,327 across 10 winters)
USDA hardiness zone4b (NRCan zone 3b)
Last spring frosttypically May 4 – May 29
First fall frosttypically October 13 – 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 G8A’s chill hours and zone:

Marginal (1)

Possible in a good year or a favorable microclimate — click through for the caveats.

Marginal varieties for this location
VarietyFruit
ReliancePeach
How many chill hours does G8A get?
G8A averages 972 chill hours per winter, ranging from 730 to 1327 across the last 10 years.
What hardiness zone is G8A?
G8A is in USDA hardiness zone 4b.

Growing fruit trees in G8A? Get a care calendar anchored to this exact climate, with email reminders.

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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