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Chill hours in G8B

The short answer

G8B averages 986 chill hours per winter (7541,395 across 10 years) in USDA zone 4b.
G8B climate
Average chill hours986 (754–1,395 across 10 winters)
USDA hardiness zone4b (NRCan zone 3a)
Last spring frosttypically May 4 – May 18
First fall frosttypically October 13 – November 4

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 G8B’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 G8B get?
G8B averages 986 chill hours per winter, ranging from 754 to 1395 across the last 10 years.
What hardiness zone is G8B?
G8B is in USDA hardiness zone 4b.

Growing fruit trees in G8B? 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