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.
Source-backed actions
Your May checklist
Search a crop or narrow the list by garden action. Dates are shifted from zone 3b's typical frost window.
Showing 12 of 67 matching actions
Transplant outdoors
28- Ageratum
flower
- Black-Eyed Susan
flower
- Broccoli
vegetable
April 26 to May 3SourceUtah State University Extension - Cabbage
vegetable
April 26 to May 3SourceUtah State University Extension
Direct sow
37- Basil
herb
- Beet
vegetable
April 26 to May 3SourceUtah State University Extension - Bok Choy
vegetable
- Borage
herb
- Broccoli
vegetable
April 26 to May 3SourceUtah State University Extension
Fall planting
1- Brussels Sprouts
vegetable
Harvest
1- Radish
vegetable
May 21 to June 17SourceUtah State University Extension
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.