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Zone 4b planting calendar

Cool climate with a roughly 4.5-month frost-free season.

Coldest temps-25 to -20°F
Avg. last spring frostMay 10
Avg. first fall frostSep 22

Open the interactive calendar for Zone 4b →

What to plant in Zone 4b

CropWhen to plant
TomatoStart seeds indoors Mar 22–Apr 5
Transplant outdoors May 17–May 24
PepperStart seeds indoors Mar 8–Mar 22
Transplant outdoors May 24–May 31
LettuceDirect sow outdoors Apr 12–May 10
Direct sow outdoors Jul 28–Aug 11
CarrotDirect sow outdoors Apr 19–May 24
Direct sow outdoors Jul 14–Jul 28
Bush BeanDirect sow outdoors May 10–Jun 7
CucumberStart seeds indoors Apr 19–Apr 26
Transplant outdoors May 17–May 24
Direct sow outdoors May 17–May 31
ZucchiniDirect sow outdoors May 10–May 31
SpinachDirect sow outdoors Mar 29–Apr 26
Direct sow outdoors Jul 28–Aug 18
KaleStart seeds indoors Mar 29–Apr 12
Transplant outdoors Apr 26–May 10
Direct sow outdoors Apr 26–May 24
Direct sow outdoors Jun 30–Jul 28
PeaDirect sow outdoors Mar 29–Apr 19
BasilStart seeds indoors Mar 29–Apr 12
Transplant outdoors May 17–May 31
CilantroDirect sow outdoors Apr 19–May 17
Direct sow outdoors Jul 28–Aug 18
BroccoliStart seeds indoors Mar 22–Apr 5
Transplant outdoors Apr 26–May 10
Direct sow outdoors Jun 16–Jul 7
CabbageStart seeds indoors Mar 15–Mar 29
Transplant outdoors Apr 26–May 10
CauliflowerStart seeds indoors Mar 22–Apr 5
Transplant outdoors Apr 26–May 10
Brussels SproutsStart seeds indoors Mar 29–Apr 12
Transplant outdoors May 3–May 17
OnionStart seeds indoors Mar 1–Mar 15
Transplant outdoors Apr 12–Apr 26
GarlicDirect sow outdoors Aug 25–Sep 8
BeetDirect sow outdoors Apr 12–May 10
Direct sow outdoors Jul 14–Jul 28
RadishDirect sow outdoors Apr 12–May 24
Direct sow outdoors Jul 28–Aug 25
Swiss ChardDirect sow outdoors Apr 26–May 24
PotatoDirect sow outdoors Apr 26–May 24
Sweet CornDirect sow outdoors May 10–May 31
EggplantStart seeds indoors Mar 15–Mar 29
Transplant outdoors May 24–May 31
PumpkinDirect sow outdoors May 10–May 31
Winter SquashDirect sow outdoors May 10–May 31
ParsleyStart seeds indoors Mar 15–Mar 29
Transplant outdoors Apr 26–May 10
Direct sow outdoors Apr 26–May 24
DillDirect sow outdoors Apr 26–May 24
Direct sow outdoors Jul 28–Aug 11
ChivesStart seeds indoors Mar 15–Mar 29
Transplant outdoors Apr 26–May 10
ThymeStart seeds indoors Mar 15–Mar 29
Transplant outdoors May 10–May 24
OreganoStart seeds indoors Mar 15–Mar 29
Transplant outdoors May 10–May 24
SageStart seeds indoors Mar 15–Mar 29
Transplant outdoors May 10–May 24
RosemaryStart seeds indoors Mar 1–Mar 15
Transplant outdoors May 24–Jun 7
MintTransplant outdoors May 10–May 24
StrawberryTransplant outdoors Apr 12–Apr 26
WatermelonStart seeds indoors Apr 12–Apr 26
Transplant outdoors May 24–May 31
Direct sow outdoors May 17–May 31
CantaloupeStart seeds indoors Apr 12–Apr 26
Transplant outdoors May 24–May 31
Direct sow outdoors May 17–May 31
Ground CherryStart seeds indoors Mar 22–Apr 5
Transplant outdoors May 17–May 24
BlueberryTransplant outdoors Apr 12–Apr 26
RaspberryTransplant outdoors Apr 5–Apr 19
MarigoldStart seeds indoors Mar 29–Apr 12
Transplant outdoors May 17–May 24
Direct sow outdoors May 10–May 24
ZinniaStart seeds indoors Apr 12–Apr 26
Transplant outdoors May 17–May 24
Direct sow outdoors May 10–May 24
SunflowerDirect sow outdoors May 10–May 31
CosmosDirect sow outdoors May 10–May 24
NasturtiumDirect sow outdoors May 10–May 24
Sweet PeaDirect sow outdoors Mar 29–Apr 19
SnapdragonStart seeds indoors Mar 15–Mar 29
Transplant outdoors Apr 26–May 10
PansyStart seeds indoors Mar 1–Mar 15
Transplant outdoors Apr 12–Apr 26
DahliaStart seeds indoors Apr 12–Apr 26
Transplant outdoors May 17–May 24
CalendulaDirect sow outdoors Apr 26–May 24
Direct sow outdoors Jul 28–Aug 11

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