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Planting Calendar for Thunder Bay, ON

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The planting calendar below tells you when to plant in the SPRING and also plant in the FALL, based on your zip code or postal code.

Spring Planting Calendar

Our spring planting calendar starts with the very first dates that you can plant (based on the last spring frost). But if you've missed these dates, no worries! This is why we've added "last planting dates" to our spring calendar; this is meant to help new gardeners understand that if they missed the first spring planting window, they could still get crops in the ground.

In fact, many crops with short maturity times (such as radishes) can be succession planted all the way through the summer in northern areas. However, note that some cool-season crops, such as kale and lettuce, do not grow well in hot temperatures, which can cause bolting issues.  For some gardeners, especially in the South, a break to avoid summer heat is needed, but they can start once the heat has passed. 

The dates provided are based on the number of weeks before or after frost, so we can provide a unique calendar to every user in the country. Thus, several crops (especially similar crops) may appear to have the same date. Kale and lettuce, for example, or dates for starting seeds, like broccoli and cabbage. 

Fall Planting Calendar

When we say "fall," we really mean planting in summer in time for a fall harvest. Think of this as a second summer! It's easy to keep the crops going if you've already prepared the soil! 

Many crops that would be started indoors for a spring crop can just be plunked into the soil directly for a fall crop. Not only is the soil already warm but also there are less pests and it tends to be rainier so you don't need to water as often. Some fall vegetables need to be harvested by the first frost, but many are frost-tolerant and even taste better after a kiss of fall frost!

See each plant's individual Growing Guide for more specific planting, plant care, and harvesting information.

Specifically, on the charts, there are different columns labeled as follows:

  1. Start Seeds Indoors: When to sow seeds indoors to get an early start on the season.
  2. Plant Seedlings Outdoors: When to put small seedlings that you grew indoors (OR starter plants that you bought at a garden nursery) in the outdoor soil.
  3. Start Seeds Outdoors: When to plant seeds directly into the outdoor soil.
  4. Last Date to Plant: You may plant any time from the "start seeds" dates until this "last date." Don't wait any longer, or the crop won't have time to get to harvest before fall/winter frosts.

The "Moon Dates" indicate the best planting dates based on Moon phases. You can learn more about this age-old technique below.

When N/A appears in the chart, that starting method is typically not recommended, although it is likely still possible. 

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Planting Dates for Spring

On average, your last spring frost occurs on June 6 (at THUNDER BAY A, ON climate station, elevation 652 feet).
CropFrost Based on Frost Dates
Moon Based on Moon Dates
Start Seeds IndoorsPlant Seedlings
or Transplants
Start Seeds OutdoorsLast Date to Plant
ArugulaFrost Apr 11-25
Moon Apr 11-23
Frost May 16-30
Moon May 16-23
Frost May 9-16
Moon May 9-16
Aug 12
AsparagusN/AN/AFrost May 23-Jun 6
Moon May 24-Jun 5
Jun 6
BasilFrost Apr 25-May 9
Moon May 7-9
Frost Jun 20-Jul 4
Moon Jun 20-21
Frost Jun 20-Jul 4
Moon Jun 20-21
Jul 29
BeetsN/AFrost May 23-Jun 6
Moon May 24-Jun 5
Frost May 9-16
Jun 20
Bell PeppersFrost Mar 28-Apr 11
Moon Apr 8-11
Frost Jun 20-27
Moon Jun 20-21
N/AJun 17
Bok ChoyFrost Apr 25-May 9
Moon May 7-9
Frost Jun 20-27
Moon Jun 20-21
Frost Jun 20-27
Moon Jun 20-21
Jul 18
BroccoliFrost Apr 11-25
Moon Apr 11-23
Frost May 23-Jun 6
Moon May 23
Frost May 9-16
Moon May 9-16
Jul 8
Brussels SproutsFrost Apr 25-May 9
Moon May 7-9
Frost May 23-Jun 6
Moon May 23
Frost May 9-16
Moon May 9-16
Jun 3
CabbageFrost Apr 11-25
Moon Apr 11-23
Frost May 23-Jun 6
Moon May 23
Frost May 9-16
Moon May 9-16
May 27
CantaloupesFrost May 16-30
Moon May 16-23
Frost Jun 6-20
Moon Jun 6-20
Frost Jun 13-20
Moon Jun 13-20
Jun 3
CarrotsN/AN/AFrost May 9-23
Jul 1
CauliflowerFrost Apr 25-May 9
Moon May 7-9
Frost May 30-Jun 13
Moon Jun 6-13
N/AJul 1
CeleryFrost Mar 14-28
Moon Mar 14-25
Frost Jun 13-27
Moon Jun 13-21
Frost Jun 6
Moon Jun 6
Jul 1
ChivesFrost Apr 11-25
Moon Apr 11-23
Frost May 16-23
Moon May 16-23
Frost May 16-23
Moon May 16-23
Jul 15
Cilantro (Coriander)N/AN/AFrost Jun 6-20
Moon Jun 6-20
Jun 27
CollardsFrost Apr 25-May 9
Moon May 7-9
Frost May 23-Jun 6
Moon May 23
Frost May 16-23
Moon May 16-23
Jul 1
CucumbersFrost May 16-23
Moon May 16-23
Frost Jun 13-27
Moon Jun 13-21
Frost Jun 20-27
Moon Jun 20-21
Jul 1
DillN/AN/AFrost May 30-Jun 20
Moon Jun 6-20
Jul 15
Dry BeansN/AN/AFrost Jun 20-27
Moon Jun 20-21
Jun 3
EggplantsFrost Apr 11-25
Moon Apr 11-23
Frost Jun 20-27
Moon Jun 20-21
N/AJul 1
Fava BeansN/AN/AFrost May 9-16
Moon May 9-16
Jun 20
FennelFrost Apr 25-May 9
Moon May 7-9
Frost Jun 13-20
Moon Jun 13-20
Frost Jun 6-20
Moon Jun 6-20
Jun 24
GarlicN/AN/AN/A
Green BeansN/AN/AFrost Jun 13-Jul 4
Moon Jun 13-21
Jul 1
Honeydew MelonsFrost May 16-23
Moon May 16-23
Frost Jun 20-27
Moon Jun 20-21
Frost Jun 20-27
Moon Jun 20-21
Jun 10
Jalapeño PeppersFrost Mar 28-Apr 11
Moon Apr 8-11
Frost Jun 20-27
Moon Jun 20-21
N/A
KaleFrost Apr 11-25
Moon Apr 11-23
Frost May 23-Jun 6
Moon May 23
Frost May 9-16
Moon May 9-16
Jun 20
KohlrabiFrost Apr 25-May 9
Moon May 7-9
Frost May 16-23
Moon May 16-23
Frost May 9-16
Moon May 9-16
Jun 20
LeeksFrost Mar 28-Apr 11
Moon Apr 8-11
Frost May 16-30
Moon May 16-23
N/AMay 27
LettuceFrost Apr 25-May 9
Moon May 7-9
Frost May 16-23
Moon May 16-23
Frost May 9-16
Moon May 9-16
Jun 20
Mustard GreensN/AN/AN/A
OkraFrost May 9-23
Moon May 9-23
Frost Jun 20-27
Moon Jun 20-21
Frost Jun 20-Jul 4
Moon Jun 20-21
Jul 1
OnionsN/AFrost May 9-23
N/AJun 3
OreganoFrost Mar 28-Apr 25
Moon Apr 8-23
Frost Jun 13-27
Moon Jun 13-21
N/AJul 1
ParsleyFrost Mar 28-Apr 11
Moon Apr 8-11
Frost Jun 13-27
Moon Jun 13-21
Frost May 9-Jun 13
Moon May 9-23, Jun 6-13
Jun 24
ParsnipsN/AN/AFrost May 9-16
Jun 3
PeanutsN/AN/AFrost Jun 27-Jul 11
Moon Jun 27-Jul 4
PeasN/AN/AFrost May 9-16
Moon May 9-16
Jun 20
PotatoesN/AN/AFrost May 9-23
Jul 1
PumpkinsFrost May 16-30
Moon May 16-23
Frost Jun 20-27
Moon Jun 20-21
Frost Jun 20-27
Moon Jun 20-21
May 27
RadishesN/AN/AFrost May 9-16
Jul 15
RosemaryFrost Mar 14-28
Moon Mar 14-25
Frost Jun 20-27
Moon Jun 20-21
N/AJul 15
SageFrost Apr 11-25
Moon Apr 11-23
Frost Jun 13-27
Moon Jun 13-21
N/AJun 24
SalsifyN/AN/AFrost May 9-23
Jun 3
SpinachFrost Apr 25-May 9
Moon May 7-9
Frost May 16-23
Moon May 16-23
Frost May 9-16
Moon May 9-16
Jun 20
Sweet CornN/AN/AFrost Jun 20-Jul 4
Moon Jun 20-21
Jun 24
Sweet PotatoesN/AN/AFrost Jun 20-Jul 4
Moon Jun 22-Jul 4
May 27
Swiss ChardFrost Apr 25-May 9
Moon May 7-9
Frost May 23-Jun 6
Moon May 23
Frost May 16-Jun 6
Moon May 16-23, Jun 6
Jun 20
ThymeFrost Mar 28-Apr 11
Moon Apr 8-11
Frost Jun 13-20
Moon Jun 13-20
N/AJun 17
TomatillosFrost Apr 25-May 9
Moon May 7-9
Frost Jun 20-Jul 4
Moon Jun 20-21
N/AJun 24
TomatoesFrost Apr 11-25
Moon Apr 11-23
Frost Jun 20-27
Moon Jun 20-21
N/AJun 10
TurnipsN/AN/AFrost May 9-16
Aug 12
WatermelonsFrost May 16-30
Moon May 16-23
Frost Jun 20-27
Moon Jun 20-21
Frost Jun 13-20
Moon Jun 13-20
Jun 10
Winter SquashFrost May 16-23
Moon May 16-23
Frost Jun 13-27
Moon Jun 13-21
Frost Jun 20-27
Moon Jun 20-21
May 20
Zucchini (Summer Squash)Frost May 16-23
Moon May 16-23
Frost Jun 13-27
Moon Jun 13-21
Frost Jun 20-27
Moon Jun 20-21
Jul 8

Planting Dates for Fall

On average, your first fall frost occurs on September 9 (at THUNDER BAY A, ON climate station).
CropFrost Based on Frost Dates
Moon Based on Moon Dates
Start Seeds OutdoorsTransplantAverage Days to MaturityFrost Tolerance
ArugulaFrost Jul 22-Aug 26
Moon Aug 4-19
N/A40Frost-hardy
BeetsFrost Jun 17-Jul 15
Moon Jun 22-Jul 4
N/A50Frost-tolerant
Bok ChoyFrost Jul 1-22
Moon Jul 5-21
N/A50Frost-tolerant
BroccoliFrost Jun 10-17
Moon Jun 10-17
Frost Jul 1-15
Moon Jul 5-15
60Frost-tolerant
Brussels SproutsFrost May 20-Jun 3
Moon May 20-23
N/A100Frost-hardy
CabbageFrost Jun 10-17
Moon Jun 10-17
Frost Jul 1-8
Moon Jul 5-8
90Frost-tolerant
CarrotsFrost Jun 24-Jul 1
Moon Jun 24-Jul 1
N/A70Frost-tolerant
CauliflowerFrost Jun 3-10
Moon Jun 6-10
Frost Jun 17-24
Moon Jun 17-21
75Frost-tolerant
ChivesFrost Jun 17-Jul 15
Moon Jun 17-21, Jul 5-15
N/A70Frost-tolerant
FennelFrost Jun 10-24
Moon Jun 10-21
N/A80Tender
GarlicFrost Sep 23-Oct 7
Moon Sep 23-Oct 1
N/A120Frost-hardy
Green BeansFrost Jun 24-Jul 8
Moon Jul 5-8
N/A55Tender
KaleFrost Jul 1-15
Moon Jul 5-15
N/A60Frost-hardy
KohlrabiFrost Jul 8-29
Moon Jul 8-21
N/A45Frost-tolerant
LettuceFrost Jul 1-15
Moon Jul 5-15
N/A60Frost-tolerant
Mustard GreensFrost Jul 8-29
Moon Jul 8-21
N/A45Tender
PeasFrost Jul 1-15
Moon Jul 5-15
N/A55Tender
RadishesFrost Jul 29-Aug 12
Moon Jul 29-Aug 3
N/A25Frost-tolerant
SpinachFrost Jul 22-Aug 12
Moon Aug 4-12
N/A30Frost-hardy
Swiss ChardFrost Jul 1-15
Moon Jul 5-15
N/A60Frost-tolerant
TurnipsFrost Jul 8-22
Moon Jul 22
N/A50Frost-tolerant
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