Growing sweet alyssum in zone 3a

(Zone 3a = an average winter low of -40°F to -35°F.)

In USDA zone 3a, the typical last spring frost is May 29 and the first fall frost is September 5. Here is when to plant sweet alyssum against those dates.

Start seeds indoorsApril 17 to April 24

Transplant outdoorsMay 22 to May 29

Direct sow outdoorsMay 1 to May 15

These are zone 3a averages

Computed from 17 ZIP codes in zone 3a. 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 sweet alyssum from NC State Extension (North Carolina Extension Gardener Plant Toolbox). Zone dates are medians; local conditions vary.