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Zone 4a planting calendar

Cold winters, short summers. Hardy greens thrive; warm crops need a head start indoors.

Coldest temps-30 to -25°F
Avg. last spring frostMay 15
Avg. first fall frostSep 18

Open the interactive calendar for Zone 4a →

What to plant in Zone 4a

CropWhen to plant
TomatoStart seeds indoors Mar 27–Apr 10
Transplant outdoors May 22–May 29
PepperStart seeds indoors Mar 13–Mar 27
Transplant outdoors May 29–Jun 5
LettuceDirect sow outdoors Apr 17–May 15
Direct sow outdoors Jul 24–Aug 7
CarrotDirect sow outdoors Apr 24–May 29
Direct sow outdoors Jul 10–Jul 24
Bush BeanDirect sow outdoors May 15–Jun 12
CucumberStart seeds indoors Apr 24–May 1
Transplant outdoors May 22–May 29
Direct sow outdoors May 22–Jun 5
ZucchiniDirect sow outdoors May 15–Jun 5
SpinachDirect sow outdoors Apr 3–May 1
Direct sow outdoors Jul 24–Aug 14
KaleStart seeds indoors Apr 3–Apr 17
Transplant outdoors May 1–May 15
Direct sow outdoors May 1–May 29
Direct sow outdoors Jun 26–Jul 24
PeaDirect sow outdoors Apr 3–Apr 24
BasilStart seeds indoors Apr 3–Apr 17
Transplant outdoors May 22–Jun 5
CilantroDirect sow outdoors Apr 24–May 22
Direct sow outdoors Jul 24–Aug 14
BroccoliStart seeds indoors Mar 27–Apr 10
Transplant outdoors May 1–May 15
Direct sow outdoors Jun 12–Jul 3
CabbageStart seeds indoors Mar 20–Apr 3
Transplant outdoors May 1–May 15
CauliflowerStart seeds indoors Mar 27–Apr 10
Transplant outdoors May 1–May 15
Brussels SproutsStart seeds indoors Apr 3–Apr 17
Transplant outdoors May 8–May 22
OnionStart seeds indoors Mar 6–Mar 20
Transplant outdoors Apr 17–May 1
GarlicDirect sow outdoors Aug 21–Sep 4
BeetDirect sow outdoors Apr 17–May 15
Direct sow outdoors Jul 10–Jul 24
RadishDirect sow outdoors Apr 17–May 29
Direct sow outdoors Jul 24–Aug 21
Swiss ChardDirect sow outdoors May 1–May 29
PotatoDirect sow outdoors May 1–May 29
Sweet CornDirect sow outdoors May 15–Jun 5
EggplantStart seeds indoors Mar 20–Apr 3
Transplant outdoors May 29–Jun 5
PumpkinDirect sow outdoors May 15–Jun 5
Winter SquashDirect sow outdoors May 15–Jun 5
ParsleyStart seeds indoors Mar 20–Apr 3
Transplant outdoors May 1–May 15
Direct sow outdoors May 1–May 29
DillDirect sow outdoors May 1–May 29
Direct sow outdoors Jul 24–Aug 7
ChivesStart seeds indoors Mar 20–Apr 3
Transplant outdoors May 1–May 15
ThymeStart seeds indoors Mar 20–Apr 3
Transplant outdoors May 15–May 29
OreganoStart seeds indoors Mar 20–Apr 3
Transplant outdoors May 15–May 29
SageStart seeds indoors Mar 20–Apr 3
Transplant outdoors May 15–May 29
RosemaryStart seeds indoors Mar 6–Mar 20
Transplant outdoors May 29–Jun 12
MintTransplant outdoors May 15–May 29
StrawberryTransplant outdoors Apr 17–May 1
WatermelonStart seeds indoors Apr 17–May 1
Transplant outdoors May 29–Jun 5
Direct sow outdoors May 22–Jun 5
CantaloupeStart seeds indoors Apr 17–May 1
Transplant outdoors May 29–Jun 5
Direct sow outdoors May 22–Jun 5
Ground CherryStart seeds indoors Mar 27–Apr 10
Transplant outdoors May 22–May 29
BlueberryTransplant outdoors Apr 17–May 1
RaspberryTransplant outdoors Apr 10–Apr 24
MarigoldStart seeds indoors Apr 3–Apr 17
Transplant outdoors May 22–May 29
Direct sow outdoors May 15–May 29
ZinniaStart seeds indoors Apr 17–May 1
Transplant outdoors May 22–May 29
Direct sow outdoors May 15–May 29
SunflowerDirect sow outdoors May 15–Jun 5
CosmosDirect sow outdoors May 15–May 29
NasturtiumDirect sow outdoors May 15–May 29
Sweet PeaDirect sow outdoors Apr 3–Apr 24
SnapdragonStart seeds indoors Mar 20–Apr 3
Transplant outdoors May 1–May 15
PansyStart seeds indoors Mar 6–Mar 20
Transplant outdoors Apr 17–May 1
DahliaStart seeds indoors Apr 17–May 1
Transplant outdoors May 22–May 29
CalendulaDirect sow outdoors May 1–May 29
Direct sow outdoors Jul 24–Aug 7

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