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2022 Planting Calendar: When to Start Vegetable Seeds | The Old Farmer's Almanac

Planting Calendar for Ontario, CA

For the Almanac's fall and spring planting calendars, we've calculated the best time to start seeds indoors, when to transplant young plants outside, and when to direct seed into the ground.

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Planting Dates for Fall

On average, your first fall frost occurs on December 22 (at ONTARIO INTL AP, CA climate station).
CropFrost Based on Frost Dates
Start Seeds Indoors by...Plant Seedlings Outdoors by...Start Seeds Outdoors by...
ArugulaN/AN/AFrost Nov 17
BeetsN/AN/AFrost Nov 7
Bell PeppersFrost Jul 9Frost Sep 3N/A
BroccoliFrost Sep 10Frost Oct 8N/A
CabbageFrost Aug 31Frost Sep 28N/A
CantaloupesN/AN/AFrost Aug 24
CarrotsN/AN/AFrost Nov 2
CauliflowerFrost Sep 10Frost Oct 8N/A
CeleryFrost Jun 30Frost Sep 8N/A
CornN/AN/AFrost Sep 13
CucumbersN/AN/AFrost Sep 18
EggplantsFrost Jul 9Frost Sep 3N/A
Green BeansN/AN/AFrost Sep 18
Jalapeño PeppersFrost Jul 29Frost Sep 23N/A
KaleFrost Sep 30Frost Oct 28N/A
KohlrabiN/AN/AFrost Nov 2
LettuceN/AN/AFrost Nov 12
OkraN/AN/AFrost Sep 13
ParsnipsN/AN/AFrost Sep 18
PeasN/AN/AFrost Oct 18
PotatoesN/AN/AFrost Oct 8
PumpkinsN/AN/AFrost Aug 4
RadishesN/AN/AFrost Nov 17
SpinachN/AN/AFrost Nov 27
Sweet PotatoesFrost Jul 20Frost Aug 24N/A
Swiss ChardN/AN/AFrost Nov 12
TomatoesFrost Jul 14Frost Sep 8N/A
TurnipsN/AN/AFrost Nov 12
WatermelonsN/AN/AFrost Aug 24
Winter SquashN/AN/AFrost Sep 8
ZucchiniN/AN/AFrost Sep 23

Planting Dates for Spring

On average, your last spring frost occurs on March 1 (at ONTARIO INTL AP, CA climate station, elevation 948 feet).
CropFrost Based on Frost Dates
Moon Based on Moon Dates
Start Seeds IndoorsPlant Seedlings
or Transplants
Start Seeds Outdoors
ArugulaN/AN/AFrost Feb 15-Mar 1
Moon Feb 15-16
BasilFrost Jan 4-18
Moon Jan 4-17
Frost Mar 1-22
Moon Mar 2-18
N/A
BeetsN/AN/AFrost Feb 15-Mar 8
Moon Feb 17-Mar 1
Bell PeppersFrost Dec 21-Jan 4
Moon Jan 2- 4
Frost Mar 8-22
Moon Mar 8-18
N/A
BroccoliFrost Jan 4-18
Moon Jan 4-17
Frost Feb 1-22
Moon Feb 1-16
N/A
CabbageFrost Jan 4-18
Moon Jan 4-17
Frost Feb 1-15
Moon Feb 1-15
N/A
CantaloupesFrost Feb 1- 8
Moon Feb 1- 8
Frost Mar 15-29
Moon Mar 15-18
N/A
CarrotsN/AN/AFrost Jan 25-Feb 8
Moon Jan 25-31
CauliflowerFrost Jan 4-18
Moon Jan 4-17
Frost Feb 1-22
Moon Feb 1-16
N/A
CeleryFrost Dec 21-Jan 4
Moon Jan 2- 4
Frost Mar 8-22
Moon Mar 8-18
N/A
ChivesN/AN/AFrost Feb 1- 8
Moon Feb 1- 8
Cilantro (Coriander)N/AN/AFrost Mar 1-15
Moon Mar 2-15
CornN/AN/AFrost Mar 15-Apr 5
Moon Mar 15-18, Apr 1- 5
CucumbersFrost Feb 1- 8
Moon Feb 1- 8
Frost Mar 15-29
Moon Mar 15-18
N/A
DillN/AN/AFrost Mar 1-Apr 5
Moon Mar 2-18
EggplantsFrost Jan 4-18
Moon Jan 4-17
Frost Mar 15-29
Moon Mar 15-18
N/A
Green BeansN/AN/AFrost Mar 8-29
Moon Mar 8-18
Jalapeño PeppersFrost Dec 21-Jan 4
Moon Jan 2- 4
Frost Mar 8-22
Moon Mar 8-18
N/A
KaleFrost Jan 4-18
Moon Jan 4-17
Frost Feb 1-22
Moon Feb 1-16
N/A
KohlrabiFrost Jan 18-Feb 1
Moon Feb 1
Frost Feb 8-15
Moon Feb 8-15
N/A
LettuceFrost Jan 18-Feb 1
Moon Feb 1
Frost Feb 15-Mar 15
Moon Feb 15-16, Mar 2-15
N/A
OkraN/AN/AFrost Mar 15-29
Moon Mar 15-18
OnionsN/AN/AFrost Feb 1-22
Moon Feb 17-22
OreganoFrost Dec 21-Jan 18
Moon Jan 2-17
Frost Mar 1-22
Moon Mar 2-18
N/A
ParsleyN/AN/AFrost Feb 1-15
Moon Feb 1-15
ParsnipsN/AN/AFrost Feb 8-Mar 1
Moon Feb 17-Mar 1
PeasN/AN/AFrost Jan 18-Feb 8
Moon Feb 1- 8
PotatoesN/AN/AFrost Feb 22-Mar 15
Moon Feb 22-Mar 1
PumpkinsFrost Feb 8-22
Moon Feb 8-16
Frost Mar 15-29
Moon Mar 15-18
N/A
RadishesN/AN/AFrost Jan 4-25
Moon Jan 18-25
RosemaryFrost Dec 21-Jan 4
Moon Jan 2- 4
Frost Mar 8-29
Moon Mar 8-18
N/A
SageFrost Jan 4-18
Moon Jan 4-17
Frost Mar 1-15
Moon Mar 2-15
N/A
SpinachN/AN/AFrost Jan 18-Feb 8
Moon Feb 1- 8
Sweet PotatoesN/AN/AFrost Mar 22-Apr 5
Moon Mar 22-31
Swiss ChardFrost Jan 18-Feb 1
Moon Feb 1
Frost Feb 8-15
Moon Feb 8-15
N/A
ThymeFrost Dec 21-Jan 18
Moon Jan 2-17
Frost Mar 1-22
Moon Mar 2-18
N/A
TomatoesFrost Jan 4-18
Moon Jan 4-17
Frost Mar 8-29
Moon Mar 8-18
N/A
TurnipsN/AN/AFrost Feb 1-22
Moon Feb 17-22
WatermelonsFrost Feb 1- 8
Moon Feb 1- 8
Frost Mar 15-29
Moon Mar 15-18
N/A
Winter SquashN/AN/AFrost Mar 15-Apr 12
Moon Mar 15-18, Apr 1-12
ZucchiniN/AN/AFrost Mar 15-Apr 12
Moon Mar 15-18, Apr 1-12