Zone 3b monthly plan
March planting calendar for zone 3b
These actions use zone 3b's typical frost dates and each crop's extension-sourced planting window.
- Last spring frost
- May 17
- First fall frost
- September 23
- Exact actions
- 25
Get dates for your exact ZIP
Zone averages cover wide areas. Your nearest NOAA station gives a more local frost window.
Planting jobs
Your March checklist
Search a crop or narrow the list by garden action. Dates are shifted from zone 3b's typical frost window.
25 matching actions, with 5 shown first
Start indoors
25- Ageratum
flower
March 8 to March 220 sources
- March 22 to April 5
0 sources
- Bachelors Button
flower
March 22 to April 50 sources
- Basil
herb
March 22 to April 50 sources
- Broccoli
vegetable
March 8 to March 220 sources
Show 20 more start indoors
- CabbageMarch 8 to March 22
- CauliflowerMarch 15 to March 29
- CeleriacFebruary 22 to March 8
- CollardsMarch 22
- EggplantMarch 22
- Forget-me-notMarch 8 to March 22
- German ChamomileMarch 22 to April 5
- Globe AmaranthMarch 22 to April 5
- Globe ArtichokeJanuary 25 to March 1
- Ground CherryMarch 29 to April 19
- ImpatiensMarch 8 to April 5
- KaleMarch 1 to March 15
- Luffa GourdMarch 22 to April 5
- Malabar SpinachMarch 22 to April 5
- ParsleyMarch 22 to April 5
- PepperMarch 22
- PetuniaMarch 8 to March 22
- StockMarch 22 to April 5
- Sweet MarjoramMarch 8 to March 22
- TomatilloMarch 29 to April 19
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.