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Sprout Authority

Growing petunia in zone 6b

In USDA zone 6b, the typical last spring frost is April 23 and the first fall frost is October 22. Here is when to plant petunia against those dates.

Start seeds indoorsFebruary 12 to February 26
Transplant outdoorsApril 23 to May 7

These are zone 6b averages

Computed from 5,242 ZIP codes in zone 6b. 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.