Zone 3a monthly plan

March planting calendar for zone 3a

These actions use zone 3a's typical frost dates and each crop's extension-sourced planting window.

Last spring frost: May 29
First fall frost: September 5
Exact actions: 12

Get dates for your exact ZIP

Zone averages cover wide areas. Your nearest NOAA station gives a more local frost window.

Exact March dates

Source-backed actions

Your March checklist

Search a crop or narrow the list by garden action. Dates are shifted from zone 3a's typical frost window.

Showing 5 of 12 matching actions

Start indoors

Ageratum
flower
March 20 to April 3SourceUniversity of Wisconsin-Madison Division of Extension (Wisconsin Horticulture)
Broccoli
vegetable
March 20 to April 3SourceUtah State University Extension
Cabbage
vegetable
March 20 to April 3SourceUtah State University Extension
Cauliflower
vegetable
March 27 to April 10SourceUtah State University Extension
Celeriac
vegetable
March 6 to March 20SourceCornell University, Home Gardening (Vegetable Growing Guides)

How this checklist is sourced

USDA defines the hardiness zone, NOAA normals provide the typical frost anchors, and each crop's extension source supplies the planting offset. Broad season-only notes are kept on plant profiles because they do not change from one zone page to another.

USDA Plant Hardiness Zone Map, 2023 by USDA Agricultural Research Service / Oregon State University PRISM Group. the USDA hardiness-zone band.
U.S. Climate Normals 1991-2020 by NOAA National Centers for Environmental Information. the median spring and fall freeze dates.

Local conditions vary.