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Planting Calendar for Knoxville, IA

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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 April 26 (at KNOXVILLE, IA climate station, elevation 895 feet).
CropFrost Based on Frost Dates
Moon Based on Moon Dates
Start Seeds IndoorsPlant Seedlings
or Transplants
Start Seeds OutdoorsLast Date to Plant
ArugulaFrost Feb 29-Mar 15
Frost Apr 5-19
Moon Apr 8-19
Frost Mar 29-Apr 5
Sep 15
AsparagusN/AN/AFrost Apr 12-26
Moon Apr 24-26
Apr 26
BasilFrost Mar 15-29
Moon Mar 15-25
Frost May 10-24
Moon May 10-23
Frost May 10-24
Moon May 10-23
Sep 1
BeetsN/AFrost Apr 12-26
Moon Apr 24-26
Frost Mar 29-Apr 5
Moon Mar 29-Apr 5
May 10
Bell PeppersFrost Feb 15-29
Moon Feb 15-24
Frost May 10-17
Moon May 10-17
N/AJul 21
Bok ChoyFrost Mar 15-29
Moon Mar 15-25
Frost May 10-17
Moon May 10-17
Frost May 10-17
Moon May 10-17
Jun 7
BroccoliFrost Feb 29-Mar 15
Frost Apr 12-26
Moon Apr 12-23
Frost Mar 29-Apr 5
Aug 11
Brussels SproutsFrost Mar 15-29
Moon Mar 15-25
Frost Apr 12-26
Moon Apr 12-23
Frost Mar 29-Apr 5
Jul 7
CabbageFrost Feb 29-Mar 15
Frost Apr 12-26
Moon Apr 12-23
Frost Mar 29-Apr 5
Jun 30
CantaloupesFrost Apr 5-19
Moon Apr 8-19
Frost Apr 26-May 10
Moon May 7-10
Frost May 3-10
Moon May 7-10
Jul 7
CarrotsN/AN/AFrost Mar 29-Apr 12
Moon Mar 29-Apr 7
Aug 4
CauliflowerFrost Mar 15-29
Moon Mar 15-25
Frost Apr 19-May 3
Moon Apr 19-23
N/AAug 4
CeleryFrost Feb 1-15
Moon Feb 9-15
Frost May 3-17
Moon May 7-17
Frost Apr 26
Aug 4
ChivesFrost Feb 29-Mar 15
Frost Apr 5-12
Moon Apr 8-12
Frost Apr 5-12
Moon Apr 8-12
Aug 18
Cilantro (Coriander)N/AN/AFrost Apr 26-May 10
Moon May 7-10
May 17
CollardsFrost Mar 15-29
Moon Mar 15-25
Frost Apr 12-26
Moon Apr 12-23
Frost Apr 5-12
Moon Apr 8-12
Aug 4
CucumbersFrost Apr 5-12
Moon Apr 8-12
Frost May 3-17
Moon May 7-17
Frost May 10-17
Moon May 10-17
Aug 4
DillN/AN/AFrost Apr 19-May 10
Moon Apr 19-23, May 7-10
Aug 18
Dry BeansN/AN/AFrost May 10-17
Moon May 10-17
Jul 7
EggplantsFrost Feb 29-Mar 15
Frost May 10-17
Moon May 10-17
N/AAug 4
Fava BeansN/AN/AFrost Mar 29-Apr 5
May 10
FennelFrost Mar 15-29
Moon Mar 15-25
Frost May 3-10
Moon May 7-10
Frost Apr 26-May 10
Moon May 7-10
Jul 28
GarlicN/AN/AN/A
Green BeansN/AN/AFrost May 3-24
Moon May 7-23
Aug 4
Honeydew MelonsFrost Apr 5-12
Moon Apr 8-12
Frost May 10-17
Moon May 10-17
Frost May 10-17
Moon May 10-17
Jul 14
Jalapeño PeppersFrost Feb 15-29
Moon Feb 15-24
Frost May 10-17
Moon May 10-17
N/A
KaleFrost Feb 29-Mar 15
Frost Apr 12-26
Moon Apr 12-23
Frost Mar 29-Apr 5
May 10
KohlrabiFrost Mar 15-29
Moon Mar 15-25
Frost Apr 5-12
Moon Apr 8-12
Frost Mar 29-Apr 5
May 10
LeeksFrost Feb 15-29
Moon Feb 15-24
Frost Apr 5-19
Moon Apr 8-19
N/AJun 30
LettuceFrost Mar 15-29
Moon Mar 15-25
Frost Apr 5-12
Moon Apr 8-12
Frost Mar 29-Apr 5
May 10
Mustard GreensN/AN/AN/A
OkraFrost Mar 29-Apr 12
Moon Apr 8-12
Frost May 10-17
Moon May 10-17
Frost May 10-24
Moon May 10-23
Aug 4
OnionsN/AFrost Mar 29-Apr 12
Moon Mar 29-Apr 7
N/AJul 7
OreganoFrost Feb 15-Mar 15
Moon Feb 15-24
Frost May 3-17
Moon May 7-17
N/AAug 4
ParsleyFrost Feb 15-29
Moon Feb 15-24
Frost May 3-17
Moon May 7-17
Frost Mar 29-May 3
Moon Apr 8-23
Jul 28
ParsnipsN/AN/AFrost Mar 29-Apr 5
Moon Mar 29-Apr 5
Jul 7
PeanutsN/AN/AFrost May 17-31
Moon May 24-31
PeasN/AN/AFrost Mar 29-Apr 5
May 10
PotatoesN/AN/AFrost Mar 29-Apr 12
Moon Mar 29-Apr 7
Aug 4
PumpkinsFrost Apr 5-19
Moon Apr 8-19
Frost May 10-17
Moon May 10-17
Frost May 10-17
Moon May 10-17
Jun 30
RadishesN/AN/AFrost Mar 29-Apr 5
Moon Mar 29-Apr 5
Aug 18
RosemaryFrost Feb 1-15
Moon Feb 9-15
Frost May 10-17
Moon May 10-17
N/AAug 18
SageFrost Feb 29-Mar 15
Frost May 3-17
Moon May 7-17
N/AJul 28
SalsifyN/AN/AFrost Mar 29-Apr 12
Moon Mar 29-Apr 7
Jul 7
SpinachFrost Mar 15-29
Moon Mar 15-25
Frost Apr 5-12
Moon Apr 8-12
Frost Mar 29-Apr 5
May 10
Sweet CornN/AN/AFrost May 10-24
Moon May 10-23
Jul 28
Sweet PotatoesN/AN/AFrost May 10-24
Moon May 24
Jun 30
Swiss ChardFrost Mar 15-29
Moon Mar 15-25
Frost Apr 12-26
Moon Apr 12-23
Frost Apr 5-26
Moon Apr 8-23
May 10
ThymeFrost Feb 15-29
Moon Feb 15-24
Frost May 3-10
Moon May 7-10
N/AJul 21
TomatillosFrost Mar 15-29
Moon Mar 15-25
Frost May 10-24
Moon May 10-23
N/AJul 28
TomatoesFrost Feb 29-Mar 15
Frost May 10-17
Moon May 10-17
N/AJul 14
TurnipsN/AN/AFrost Mar 29-Apr 5
Moon Mar 29-Apr 5
Sep 15
WatermelonsFrost Apr 5-19
Moon Apr 8-19
Frost May 10-17
Moon May 10-17
Frost May 3-10
Moon May 7-10
Jul 14
Winter SquashFrost Apr 5-12
Moon Apr 8-12
Frost May 3-17
Moon May 7-17
Frost May 10-17
Moon May 10-17
Jun 23
Zucchini (Summer Squash)Frost Apr 5-12
Moon Apr 8-12
Frost May 3-17
Moon May 7-17
Frost May 10-17
Moon May 10-17
Aug 11

Planting Dates for Fall

On average, your first fall frost occurs on October 13 (at KNOXVILLE, IA climate station).
CropFrost Based on Frost Dates
Moon Based on Moon Dates
Start Seeds OutdoorsTransplantAverage Days to MaturityFrost Tolerance
ArugulaFrost Aug 25-Sep 29
Moon Sep 2-17
N/A40Frost-hardy
BeetsFrost Jul 21-Aug 18
Moon Jul 22-Aug 3
N/A50Frost-tolerant
Bok ChoyFrost Aug 4-25
Moon Aug 4-19
N/A50Frost-tolerant
BroccoliFrost Jul 14-21
Moon Jul 14-21
Frost Aug 4-18
Moon Aug 4-18
60Frost-tolerant
Brussels SproutsFrost Jun 23-Jul 7
Moon Jul 5-7
N/A100Frost-hardy
CabbageFrost Jul 14-21
Moon Jul 14-21
Frost Aug 4-11
Moon Aug 4-11
90Frost-tolerant
CarrotsFrost Jul 28-Aug 4
Moon Jul 28-Aug 3
N/A70Frost-tolerant
CauliflowerFrost Jul 7-14
Moon Jul 7-14
Frost Jul 21-28
Moon Jul 21
75Frost-tolerant
ChivesFrost Jul 21-Aug 18
Moon Jul 21, Aug 5-18
N/A70Frost-tolerant
FennelFrost Jul 14-28
Moon Jul 14-21
N/A80Tender
GarlicFrost Oct 27-Nov 9
Moon Oct 27-31
N/A120Frost-hardy
Green BeansFrost Jul 28-Aug 11
Moon Aug 4-11
N/A55Tender
KaleFrost Aug 4-18
Moon Aug 4-18
N/A60Frost-hardy
KohlrabiFrost Aug 11-Sep 1
Moon Aug 11-19
N/A45Frost-tolerant
LettuceFrost Aug 4-18
Moon Aug 4-18
N/A60Frost-tolerant
Mustard GreensFrost Aug 11-Sep 1
Moon Aug 11-19
N/A45Tender
PeasFrost Aug 4-18
Moon Aug 4-18
N/A55Tender
RadishesFrost Sep 1-15
Moon Sep 1
N/A25Frost-tolerant
SpinachFrost Aug 25-Sep 15
Moon Sep 2-15
N/A30Frost-hardy
Swiss ChardFrost Aug 4-18
Moon Aug 4-18
N/A60Frost-tolerant
TurnipsFrost Aug 11-25
Moon Aug 20-25
N/A50Frost-tolerant
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