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Planting Calendar for Mills, WY

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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 May 16 (at CASPER WWTP, WY climate station, elevation 5098 feet).
CropFrost Based on Frost Dates
Moon Based on Moon Dates
Start Seeds IndoorsPlant Seedlings
or Transplants
Start Seeds OutdoorsLast Date to Plant
ArugulaFrost Mar 21-Apr 4
Moon Mar 21-25
Frost Apr 25-May 9
Moon May 7-9
Frost Apr 18-25
Moon Apr 18-23
Aug 26
AsparagusN/AN/AFrost May 2-16
Moon May 2-6
May 16
BasilFrost Apr 4-18
Moon Apr 8-18
Frost May 30-Jun 13
Moon Jun 6-13
Frost May 30-Jun 13
Moon Jun 6-13
Aug 12
BeetsN/AFrost May 2-16
Moon May 2-6
Frost Apr 18-25
Moon Apr 24-25
May 30
Bell PeppersFrost Mar 6-21
Frost May 30-Jun 6
Moon Jun 6
N/AJul 1
Bok ChoyFrost Apr 4-18
Moon Apr 8-18
Frost May 30-Jun 6
Moon Jun 6
Frost May 30-Jun 6
Moon Jun 6
Jun 27
BroccoliFrost Mar 21-Apr 4
Moon Mar 21-25
Frost May 2-16
Moon May 7-16
Frost Apr 18-25
Moon Apr 18-23
Jul 22
Brussels SproutsFrost Apr 4-18
Moon Apr 8-18
Frost May 2-16
Moon May 7-16
Frost Apr 18-25
Moon Apr 18-23
Jun 17
CabbageFrost Mar 21-Apr 4
Moon Mar 21-25
Frost May 2-16
Moon May 7-16
Frost Apr 18-25
Moon Apr 18-23
Jun 10
CantaloupesFrost Apr 25-May 9
Moon May 7-9
Frost May 16-30
Moon May 16-23
Frost May 23-30
Moon May 23
Jun 17
CarrotsN/AN/AFrost Apr 18-May 2
Moon Apr 24-May 2
Jul 15
CauliflowerFrost Apr 4-18
Moon Apr 8-18
Frost May 9-23
Moon May 9-23
N/AJul 15
CeleryFrost Feb 21-Mar 6
Moon Feb 21-24
Frost May 23-Jun 6
Moon May 23
Frost May 16
Moon May 16
Jul 15
ChivesFrost Mar 21-Apr 4
Moon Mar 21-25
Frost Apr 25-May 2
Frost Apr 25-May 2
Jul 29
Cilantro (Coriander)N/AN/AFrost May 16-30
Moon May 16-23
Jun 6
CollardsFrost Apr 4-18
Moon Apr 8-18
Frost May 2-16
Moon May 7-16
Frost Apr 25-May 2
Jul 15
CucumbersFrost Apr 25-May 2
Frost May 23-Jun 6
Moon May 23
Frost May 30-Jun 6
Moon Jun 6
Jul 15
DillN/AN/AFrost May 9-30
Moon May 9-23
Jul 29
Dry BeansN/AN/AFrost May 30-Jun 6
Moon Jun 6
Jun 17
EggplantsFrost Mar 21-Apr 4
Moon Mar 21-25
Frost May 30-Jun 6
Moon Jun 6
N/AJul 15
Fava BeansN/AN/AFrost Apr 18-25
Moon Apr 18-23
May 30
FennelFrost Apr 4-18
Moon Apr 8-18
Frost May 23-30
Moon May 23
Frost May 16-30
Moon May 16-23
Jul 8
GarlicN/AN/AN/A
Green BeansN/AN/AFrost May 23-Jun 13
Moon May 23, Jun 7-13
Jul 15
Honeydew MelonsFrost Apr 25-May 2
Frost May 30-Jun 6
Moon Jun 6
Frost May 30-Jun 6
Moon Jun 6
Jun 24
Jalapeño PeppersFrost Mar 6-21
Frost May 30-Jun 6
Moon Jun 6
N/A
KaleFrost Mar 21-Apr 4
Moon Mar 21-25
Frost May 2-16
Moon May 7-16
Frost Apr 18-25
Moon Apr 18-23
May 30
KohlrabiFrost Apr 4-18
Moon Apr 8-18
Frost Apr 25-May 2
Frost Apr 18-25
Moon Apr 18-23
May 30
LeeksFrost Mar 6-21
Frost Apr 25-May 9
Moon May 7-9
N/AJun 10
LettuceFrost Apr 4-18
Moon Apr 8-18
Frost Apr 25-May 2
Frost Apr 18-25
Moon Apr 18-23
May 30
Mustard GreensN/AN/AN/A
OkraFrost Apr 18-May 2
Moon Apr 18-23
Frost May 30-Jun 6
Moon Jun 6
Frost May 30-Jun 13
Moon Jun 6-13
Jul 15
OnionsN/AFrost Apr 18-May 2
Moon Apr 24-May 2
N/AJun 17
OreganoFrost Mar 6-Apr 4
Moon Mar 22-25
Frost May 23-Jun 6
Moon May 23
N/AJul 15
ParsleyFrost Mar 6-21
Frost May 23-Jun 6
Moon May 23
Frost Apr 18-May 23
Moon Apr 18-23, May 7-23
Jul 8
ParsnipsN/AN/AFrost Apr 18-25
Moon Apr 24-25
Jun 17
PeanutsN/AN/AFrost Jun 6-20
PeasN/AN/AFrost Apr 18-25
Moon Apr 18-23
May 30
PotatoesN/AN/AFrost Apr 18-May 2
Moon Apr 24-May 2
Jul 15
PumpkinsFrost Apr 25-May 9
Moon May 7-9
Frost May 30-Jun 6
Moon Jun 6
Frost May 30-Jun 6
Moon Jun 6
Jun 10
RadishesN/AN/AFrost Apr 18-25
Moon Apr 24-25
Jul 29
RosemaryFrost Feb 21-Mar 6
Moon Feb 21-24
Frost May 30-Jun 6
Moon Jun 6
N/AJul 29
SageFrost Mar 21-Apr 4
Moon Mar 21-25
Frost May 23-Jun 6
Moon May 23
N/AJul 8
SalsifyN/AN/AFrost Apr 18-May 2
Moon Apr 24-May 2
Jun 17
SpinachFrost Apr 4-18
Moon Apr 8-18
Frost Apr 25-May 2
Frost Apr 18-25
Moon Apr 18-23
May 30
Sweet CornN/AN/AFrost May 30-Jun 13
Moon Jun 6-13
Jul 8
Sweet PotatoesN/AN/AFrost May 30-Jun 13
Moon May 30-Jun 5
Jun 10
Swiss ChardFrost Apr 4-18
Moon Apr 8-18
Frost May 2-16
Moon May 7-16
Frost Apr 25-May 16
Moon May 7-16
May 30
ThymeFrost Mar 6-21
Frost May 23-30
Moon May 23
N/AJul 1
TomatillosFrost Apr 4-18
Moon Apr 8-18
Frost May 30-Jun 13
Moon Jun 6-13
N/AJul 8
TomatoesFrost Mar 21-Apr 4
Moon Mar 21-25
Frost May 30-Jun 6
Moon Jun 6
N/AJun 24
TurnipsN/AN/AFrost Apr 18-25
Moon Apr 24-25
Aug 26
WatermelonsFrost Apr 25-May 9
Moon May 7-9
Frost May 30-Jun 6
Moon Jun 6
Frost May 23-30
Moon May 23
Jun 24
Winter SquashFrost Apr 25-May 2
Frost May 23-Jun 6
Moon May 23
Frost May 30-Jun 6
Moon Jun 6
Jun 3
Zucchini (Summer Squash)Frost Apr 25-May 2
Frost May 23-Jun 6
Moon May 23
Frost May 30-Jun 6
Moon Jun 6
Jul 22

Planting Dates for Fall

On average, your first fall frost occurs on September 23 (at CASPER WWTP, WY climate station).
CropFrost Based on Frost Dates
Moon Based on Moon Dates
Start Seeds OutdoorsTransplantAverage Days to MaturityFrost Tolerance
ArugulaFrost Aug 5-Sep 9
Moon Aug 5-19, Sep 2-9
N/A40Frost-hardy
BeetsFrost Jul 1-29
Moon Jul 1-4, Jul 22-29
N/A50Frost-tolerant
Bok ChoyFrost Jul 15-Aug 5
Moon Jul 15-21, Aug 4-5
N/A50Frost-tolerant
BroccoliFrost Jun 24-Jul 1
Frost Jul 15-29
Moon Jul 15-21
60Frost-tolerant
Brussels SproutsFrost Jun 3-17
Moon Jun 6-17
N/A100Frost-hardy
CabbageFrost Jun 24-Jul 1
Frost Jul 15-22
Moon Jul 15-21
90Frost-tolerant
CarrotsFrost Jul 8-15
N/A70Frost-tolerant
CauliflowerFrost Jun 17-24
Moon Jun 17-21
Frost Jul 1-8
Moon Jul 5-8
75Frost-tolerant
ChivesFrost Jul 1-29
Moon Jul 5-21
N/A70Frost-tolerant
FennelFrost Jun 24-Jul 8
Moon Jul 5-8
N/A80Tender
GarlicFrost Oct 7-21
Moon Oct 18-21
N/A120Frost-hardy
Green BeansFrost Jul 8-22
Moon Jul 8-21
N/A55Tender
KaleFrost Jul 15-29
Moon Jul 15-21
N/A60Frost-hardy
KohlrabiFrost Jul 22-Aug 12
Moon Aug 4-12
N/A45Frost-tolerant
LettuceFrost Jul 15-29
Moon Jul 15-21
N/A60Frost-tolerant
Mustard GreensFrost Jul 22-Aug 12
Moon Aug 4-12
N/A45Tender
PeasFrost Jul 15-29
Moon Jul 15-21
N/A55Tender
RadishesFrost Aug 12-26
Moon Aug 20-26
N/A25Frost-tolerant
SpinachFrost Aug 5-26
Moon Aug 5-19
N/A30Frost-hardy
Swiss ChardFrost Jul 15-29
Moon Jul 15-21
N/A60Frost-tolerant
TurnipsFrost Jul 22-Aug 5
Moon Jul 22-Aug 3
N/A50Frost-tolerant
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