Zone 4b monthly plan
March planting calendar for zone 4b
These actions use zone 4b's typical frost dates and each crop's extension-sourced planting window.
- Last spring frost
- May 8
- First fall frost
- October 1
- Exact actions
- 36
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 4b's typical frost window.
36 matching actions, with 5 shown first
Start indoors
36- Ageratum
flower
February 27 to March 130 sources
- March 13 to March 27
0 sources
- Bachelors Button
flower
March 13 to March 270 sources
- Basil
herb
March 13 to March 270 sources
- Bok Choy
vegetable
March 27 to April 100 sources
Show 31 more start indoors
- BroccoliFebruary 27 to March 13
- CabbageFebruary 27 to March 13
- CauliflowerMarch 6 to March 20
- CollardsMarch 13
- CucamelonMarch 27 to April 10
- EggplantMarch 13
- FennelMarch 27 to April 10
- Forget-me-notFebruary 27 to March 13
- German ChamomileMarch 13 to March 27
- Globe AmaranthMarch 13 to March 27
- Ground CherryMarch 20 to April 10
- ImpatiensFebruary 27 to March 27
- KaleFebruary 20 to March 6
- LettuceMarch 27 to April 3
- Luffa GourdMarch 13 to March 27
- Malabar SpinachMarch 13 to March 27
- MarigoldMarch 27 to April 10
- MoonflowerMarch 27 to April 10
- NasturtiumMarch 27 to April 10
- ParsleyMarch 13 to March 27
- PepperMarch 13
- PetuniaFebruary 27 to March 13
- RhubarbMarch 27
- RomanescoMarch 27 to April 10
- SpinachMarch 27 to April 3
- StockMarch 13 to March 27
- Sweet AlyssumMarch 27 to April 3
- Sweet MarjoramFebruary 27 to March 13
- Swiss ChardMarch 27 to April 3
- TomatilloMarch 20 to April 10
- TomatoMarch 27 to April 3
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.