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Sprout Authority

Growing petunia in zone 5b

In USDA zone 5b, the typical last spring frost is May 1 and the first fall frost is October 10. Here is when to plant petunia against those dates.

Start seeds indoorsFebruary 20 to March 6
Transplant outdoorsMay 1 to May 15

These are zone 5b averages

Computed from 2,843 ZIP codes in zone 5b. Your town's frost dates vary; enter your ZIP for dates built on your nearest weather station.

Get my exact dates

USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service / Oregon State University PRISM Group. NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020. Planting windows for petunia from Clemson Cooperative Extension, Home & Garden Information Center. Zone dates are medians; local conditions vary.