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Chill hours in P3C

The short answer

P3C averages 1,173 chill hours per winter (9771,465 across 10 years) in USDA zone 4b.
P3C climate
Average chill hours1,173 (977–1,465 across 10 winters)
USDA hardiness zone4b (NRCan zone 4b)
Last spring frosttypically April 27 – May 18
First fall frosttypically October 17 – October 29

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 P3C’s chill hours and zone:

How many chill hours does P3C get?
P3C averages 1173 chill hours per winter, ranging from 977 to 1465 across the last 10 years.
What hardiness zone is P3C?
P3C 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