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Chill hours in P3A

The short answer

P3A averages 1,163 chill hours per winter (9641,469 across 10 years) in USDA zone 4b.
P3A climate
Average chill hours1,163 (964–1,469 across 10 winters)
USDA hardiness zone4b (NRCan zone 4b)
Last spring frosttypically April 27 – May 17
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 P3A’s chill hours and zone:

How many chill hours does P3A get?
P3A averages 1163 chill hours per winter, ranging from 964 to 1469 across the last 10 years.
What hardiness zone is P3A?
P3A 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