Zone 3b monthly plan
May 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
- 67
Get dates for your exact ZIP
Zone averages cover wide areas. Your nearest NOAA station gives a more local frost window.
Planting jobs
Your May checklist
Search a crop or narrow the list by garden action. Dates are shifted from zone 3b's typical frost window.
67 matching actions, with 12 shown first
Transplant outdoors
28- Ageratum
flower
May 17 to May 310 sources
- May 17 to May 31
0 sources
- Black-Eyed Susan
flower
May 17 to May 310 sources
- Broccoli
vegetable
April 26 to May 30 sources
- Cabbage
vegetable
April 26 to May 30 sources
Show 23 more transplant outdoors
- CantaloupeMay 17 to May 31
- CauliflowerMay 3 to May 10
- CeleriacMay 3
- CollardsMay 3
- CucumberMay 17 to May 31
- DahliaMay 17 to May 31
- EggplantMay 17 to May 31
- French TarragonMay 17
- Globe AmaranthMay 17 to May 31
- Ground CherryMay 17 to May 31
- ImpatiensMay 17 to May 31
- LettuceMay 17
- MarigoldMay 17 to May 31
- PepperMay 17 to May 31
- PetuniaMay 17 to May 31
- RomanescoMay 17
- SpinachMay 17
- Sweet AlyssumMay 10 to May 17
- Swiss ChardMay 17
- TomatilloMay 24 to May 31
- TomatoMay 17 to May 31
- WatermelonMay 17 to May 31
- Wax BegoniaMay 17 to May 31
Direct sow
37- Basil
herb
May 170 sources
- Beet
vegetable
April 26 to May 30 sources
- Bok Choy
vegetable
May 170 sources
- Borage
herb
May 170 sources
- Broccoli
vegetable
April 26 to May 30 sources
Show 32 more direct sow
- CabbageApril 26 to May 3
- CantaloupeMay 17 to May 31
- CarrotApril 26 to May 3
- CauliflowerMay 3 to May 10
- CosmosMay 17 to May 31
- CucamelonMay 17
- CucumberMay 17 to May 31
- DillMay 17
- FennelMay 17
- German ChamomileMay 10 to May 17
- Green Bean (Snap Bean)May 10
- KohlrabiApril 19 to May 3
- LettuceApril 26 to May 3
- Luffa GourdMay 17
- MarigoldMay 17 to May 31
- Mexican SunflowerMay 17 to May 31
- Mustard GreensApril 26 to May 17
- NasturtiumMay 17 to May 31
- New Zealand SpinachMay 17 to May 24
- ParsleyMay 17
- ParsnipApril 26 to May 3
- PotatoApril 26 to May 3
- PumpkinMay 17 to May 31
- RadishApril 26 to May 3
- SunflowerMay 17 to May 31
- Sweet AlyssumApril 19 to May 3
- Sweet CornMay 17 to May 31
- Sweet MarjoramMay 17
- TomatilloMay 3
- WatermelonMay 17 to May 31
- Winter SquashMay 17 to May 31
- ZucchiniMay 17 to May 31
Fall planting
1- Brussels Sprouts
vegetable
May 270 sources
Harvest
1- Radish
vegetable
May 21 to June 170 sources
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.