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Planting Calendar for Roundup, MT | Almanac.com
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Planting Calendar for Roundup, MT

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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-seasons 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 26 (at ROUNDUP, MT climate station, elevation 3198 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 31-Apr 14
Moon Apr 8-14
Frost May 5-19
Moon May 7-19
Frost Apr 28-May 5
Aug 17
AsparagusN/AN/AFrost May 12-26
Moon May 24-26
May 26
BasilFrost Apr 14-28
Moon Apr 14-23
Frost Jun 9-23
Moon Jun 9-21
Frost Jun 9-23
Moon Jun 9-21
Aug 3
BeetsN/AFrost May 12-26
Moon May 24-26
Frost Apr 28-May 5
Moon Apr 28-May 5
Jun 9
Bell PeppersFrost Mar 17-31
Moon Mar 17-25
Frost Jun 9-16
Moon Jun 9-16
N/AJun 22
Bok ChoyFrost Apr 14-28
Moon Apr 14-23
Frost Jun 9-16
Moon Jun 9-16
Frost Jun 9-16
Moon Jun 9-16
Jul 7
BroccoliFrost Mar 31-Apr 14
Moon Apr 8-14
Frost May 12-26
Moon May 12-23
Frost Apr 28-May 5
Jul 13
Brussels SproutsFrost Apr 14-28
Moon Apr 14-23
Frost May 12-26
Moon May 12-23
Frost Apr 28-May 5
Jun 8
CabbageFrost Mar 31-Apr 14
Moon Apr 8-14
Frost May 12-26
Moon May 12-23
Frost Apr 28-May 5
Jun 1
CantaloupesFrost May 5-19
Moon May 7-19
Frost May 26-Jun 9
Moon Jun 6-9
Frost Jun 2-9
Moon Jun 6-9
Jun 8
CarrotsN/AN/AFrost Apr 28-May 12
Moon Apr 28-May 6
Jul 6
CauliflowerFrost Apr 14-28
Moon Apr 14-23
Frost May 19-Jun 2
Moon May 19-23
N/AJul 6
CeleryFrost Mar 2-17
Frost Jun 2-16
Moon Jun 6-16
Frost May 26
Jul 6
ChivesFrost Mar 31-Apr 14
Moon Apr 8-14
Frost May 5-12
Moon May 7-12
Frost May 5-12
Moon May 7-12
Jul 20
Cilantro (Coriander)N/AN/AFrost May 26-Jun 9
Moon Jun 6-9
Jun 16
CollardsFrost Apr 14-28
Moon Apr 14-23
Frost May 12-26
Moon May 12-23
Frost May 5-12
Moon May 7-12
Jul 6
CucumbersFrost May 5-12
Moon May 7-12
Frost Jun 2-16
Moon Jun 6-16
Frost Jun 9-16
Moon Jun 9-16
Jul 6
DillN/AN/AFrost May 19-Jun 9
Moon May 19-23, Jun 6-9
Jul 20
Dry BeansN/AN/AFrost Jun 9-16
Moon Jun 9-16
Jun 8
EggplantsFrost Mar 31-Apr 14
Moon Apr 8-14
Frost Jun 9-16
Moon Jun 9-16
N/AJul 6
Fava BeansN/AN/AFrost Apr 28-May 5
Jun 9
FennelFrost Apr 14-28
Moon Apr 14-23
Frost Jun 2-9
Moon Jun 6-9
Frost May 26-Jun 9
Moon Jun 6-9
Jun 29
GarlicN/AN/AN/A
Green BeansN/AN/AFrost Jun 2-23
Moon Jun 6-21
Jul 6
Honeydew MelonsFrost May 5-12
Moon May 7-12
Frost Jun 9-16
Moon Jun 9-16
Frost Jun 9-16
Moon Jun 9-16
Jun 15
Jalapeño PeppersFrost Mar 17-31
Moon Mar 17-25
Frost Jun 9-16
Moon Jun 9-16
N/A
KaleFrost Mar 31-Apr 14
Moon Apr 8-14
Frost May 12-26
Moon May 12-23
Frost Apr 28-May 5
Jun 9
KohlrabiFrost Apr 14-28
Moon Apr 14-23
Frost May 5-12
Moon May 7-12
Frost Apr 28-May 5
Jun 9
LeeksFrost Mar 17-31
Moon Mar 17-25
Frost May 5-19
Moon May 7-19
N/AJun 1
LettuceFrost Apr 14-28
Moon Apr 14-23
Frost May 5-12
Moon May 7-12
Frost Apr 28-May 5
Jun 9
Mustard GreensN/AN/AN/A
OkraFrost Apr 28-May 12
Moon May 7-12
Frost Jun 9-16
Moon Jun 9-16
Frost Jun 9-23
Moon Jun 9-21
Jul 6
OnionsN/AFrost Apr 28-May 12
Moon Apr 28-May 6
N/AJun 8
OreganoFrost Mar 17-Apr 14
Moon Mar 17-25, Apr 8-14
Frost Jun 2-16
Moon Jun 6-16
N/AJul 6
ParsleyFrost Mar 17-31
Moon Mar 17-25
Frost Jun 2-16
Moon Jun 6-16
Frost Apr 28-Jun 2
Moon May 7-23
Jun 29
ParsnipsN/AN/AFrost Apr 28-May 5
Moon Apr 28-May 5
Jun 8
PeasN/AN/AFrost Apr 28-May 5
Jun 9
PotatoesN/AN/AFrost Apr 28-May 12
Moon Apr 28-May 6
Jul 6
PumpkinsFrost May 5-19
Moon May 7-19
Frost Jun 9-16
Moon Jun 9-16
Frost Jun 9-16
Moon Jun 9-16
Jun 1
RadishesN/AN/AFrost Apr 28-May 5
Moon Apr 28-May 5
Jul 20
RosemaryFrost Mar 2-17
Frost Jun 9-16
Moon Jun 9-16
N/AJul 20
SageFrost Mar 31-Apr 14
Moon Apr 8-14
Frost Jun 2-16
Moon Jun 6-16
N/AJun 29
SalsifyN/AN/AFrost Apr 28-May 12
Moon Apr 28-May 6
Jun 8
SpinachFrost Apr 14-28
Moon Apr 14-23
Frost May 5-12
Moon May 7-12
Frost Apr 28-May 5
Jun 9
Sweet CornN/AN/AFrost Jun 9-23
Moon Jun 9-21
Jun 29
Sweet PotatoesN/AN/AFrost Jun 9-23
Moon Jun 22-23
Jun 1
Swiss ChardFrost Apr 14-28
Moon Apr 14-23
Frost May 12-26
Moon May 12-23
Frost May 5-26
Moon May 7-23
Jun 9
ThymeFrost Mar 17-31
Moon Mar 17-25
Frost Jun 2-9
Moon Jun 6-9
N/AJun 22
TomatillosFrost Apr 14-28
Moon Apr 14-23
Frost Jun 9-23
Moon Jun 9-21
N/AJun 29
TomatoesFrost Mar 31-Apr 14
Moon Apr 8-14
Frost Jun 9-16
Moon Jun 9-16
N/AJun 15
TurnipsN/AN/AFrost Apr 28-May 5
Moon Apr 28-May 5
Aug 17
WatermelonsFrost May 5-19
Moon May 7-19
Frost Jun 9-16
Moon Jun 9-16
Frost Jun 2-9
Moon Jun 6-9
Jun 15
Winter SquashFrost May 5-12
Moon May 7-12
Frost Jun 2-16
Moon Jun 6-16
Frost Jun 9-16
Moon Jun 9-16
May 25
Zucchini (Summer Squash)Frost May 5-12
Moon May 7-12
Frost Jun 2-16
Moon Jun 6-16
Frost Jun 9-16
Moon Jun 9-16
Jul 13

Planting Dates for Fall

On average, your first fall frost occurs on September 14 (at ROUNDUP, MT climate station).
CropFrost Based on Frost Dates
Moon Based on Moon Dates
Start Seeds OutdoorsTransplantAverage Days to MaturityFrost Tolerance
ArugulaFrost Jul 27-Aug 31
Moon Aug 4-19
N/A40Frost-hardy
BeetsFrost Jun 22-Jul 20
Moon Jun 22-Jul 4
N/A50Frost-tolerant
Bok ChoyFrost Jul 6-27
Moon Jul 6-21
N/A50Frost-tolerant
BroccoliFrost Jun 15-22
Moon Jun 15-21
Frost Jul 6-20
Moon Jul 6-20
60Frost-tolerant
Brussels SproutsFrost May 25-Jun 8
Moon Jun 6-8
N/A100Frost-hardy
CabbageFrost Jun 15-22
Moon Jun 15-21
Frost Jul 6-13
Moon Jul 6-13
90Frost-tolerant
CarrotsFrost Jun 29-Jul 6
Moon Jun 29-Jul 4
N/A70Frost-tolerant
CauliflowerFrost Jun 8-15
Moon Jun 8-15
Frost Jun 22-29
75Frost-tolerant
ChivesFrost Jun 22-Jul 20
Moon Jul 5-20
N/A70Frost-tolerant
FennelFrost Jun 15-29
Moon Jun 15-21
N/A80Tender
GarlicFrost Sep 28-Oct 12
Moon Sep 28-Oct 1
N/A120Frost-hardy
Green BeansFrost Jun 29-Jul 13
Moon Jul 5-13
N/A55Tender
KaleFrost Jul 6-20
Moon Jul 6-20
N/A60Frost-hardy
KohlrabiFrost Jul 13-Aug 3
Moon Jul 13-21
N/A45Frost-tolerant
LettuceFrost Jul 6-20
Moon Jul 6-20
N/A60Frost-tolerant
Mustard GreensFrost Jul 13-Aug 3
Moon Jul 13-21
N/A45Tender
PeasFrost Jul 6-20
Moon Jul 6-20
N/A55Tender
RadishesFrost Aug 3-17
Moon Aug 3
N/A25Frost-tolerant
SpinachFrost Jul 27-Aug 17
Moon Aug 4-17
N/A30Frost-hardy
Swiss ChardFrost Jul 6-20
Moon Jul 6-20
N/A60Frost-tolerant
TurnipsFrost Jul 13-27
Moon Jul 22-27
N/A50Frost-tolerant
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