Zone 4a monthly plan
March planting calendar for zone 4a
These actions use zone 4a's typical frost dates and each crop's extension-sourced planting window.
- Last spring frost
- May 12
- First fall frost
- September 28
- Exact actions
- 37
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 4a's typical frost window.
37 matching actions, with 5 shown first
Start indoors
37- Ageratum
flower
March 3 to March 170 sources
- March 17 to March 31
0 sources
- Bachelors Button
flower
March 17 to March 310 sources
- Basil
herb
March 17 to March 310 sources
- Bok Choy
vegetable
March 31 to April 140 sources
Show 32 more start indoors
- BroccoliMarch 3 to March 17
- CabbageMarch 3 to March 17
- CauliflowerMarch 10 to March 24
- CeleriacFebruary 17 to March 3
- CollardsMarch 17
- CucamelonMarch 31 to April 14
- EggplantMarch 17
- FennelMarch 31 to April 14
- Forget-me-notMarch 3 to March 17
- German ChamomileMarch 17 to March 31
- Globe AmaranthMarch 17 to March 31
- Ground CherryMarch 24 to April 14
- ImpatiensMarch 3 to March 31
- KaleFebruary 24 to March 10
- LettuceMarch 31 to April 7
- Luffa GourdMarch 17 to March 31
- Malabar SpinachMarch 17 to March 31
- MarigoldMarch 31 to April 14
- MoonflowerMarch 31 to April 14
- NasturtiumMarch 31 to April 14
- ParsleyMarch 17 to March 31
- PepperMarch 17
- PetuniaMarch 3 to March 17
- RhubarbMarch 31
- RomanescoMarch 31 to April 14
- SpinachMarch 31 to April 7
- StockMarch 17 to March 31
- Sweet AlyssumMarch 31 to April 7
- Sweet MarjoramMarch 3 to March 17
- Swiss ChardMarch 31 to April 7
- TomatilloMarch 24 to April 14
- TomatoMarch 31 to April 7
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.