Planting timing
When to plant collards
Plant collards on the cited sheets — not on a national calendar month. Regional and season notes stay source-specific.
Growing guidance is general information. Timing, spacing, and care depend on cultivar, weather, soil, and local conditions. Check the sources and adjust the plan for your garden.
Dates stay on the named cards below — not one planting window.
Spacing lives on the collards hub. Timing stays on the cited sheets.
Spacing lives on how to grow collards.
What the sources say — at a glance
One source per card. Facts are not averaged.
UMN Extension (Minnesota)
Soil workable. Indoor April. Fall indoor June. Three months before average frost.
Details and limits (2)
When
UMN Extension (Minnesota): sow seeds in the spring for an early summer crop as soon as the soil is workable. Direct seed again about three months before the average frost date for a fall crop. Start seeds indoors in April. For fall crops, start seed indoors in June.
Limit
Not one BioArva calendar and not a ZIP tool.
Maryland Extension (Maryland)
March–April and early June–early July indoor. April–May and early July–early August transplant.
Details and limits (2)
When
Maryland Extension (Maryland): collards, March through April, and again early June through early July, plant seeds indoors to grow seedlings. April and May, and early July through early August, transplant seedlings into the ground.
Limit
Not one BioArva calendar and not a ZIP tool.
Maryland Extension (Maryland)
As soon as soil can be worked. 3–4 weeks prior to frost date. 3- to 5-week transplants.
Details and limits (2)
When
Maryland Extension (Maryland): in spring, plant seeds as soon as soil can be worked (3 to 4 weeks prior to frost date). Or start seeds indoors and plant 3- to 5-week old transplants into garden soil.
Limit
Not one BioArva calendar and not a ZIP tool.
Illinois Extension (Illinois)
Early spring. Midsummer.
Details and limits (2)
When
Illinois Extension (Illinois): plant in early spring for summer harvest and again in midsummer for fall and early winter harvest.
Limit
Not one BioArva calendar and not a ZIP tool.
Clemson HGIC 1307 (South Carolina)
Piedmont Mar 15–Jun 30 / Aug 1–Sep 30. Coastal Feb 1–Jun 15 / Aug 1–Oct 30.
Details and limits (2)
When
Clemson HGIC 1307 (South Carolina): Piedmont spring Mar 15 to Jun 30 and fall Aug 1 to Sept 30. Coastal spring Feb 1 to Jun 15 and fall Aug 1 to Oct 30.
Limit
Not one BioArva calendar and not a ZIP tool.
Sources differ
Make it yours
Save the bed in the Field Book so next season is not a guess.
Verified suppliers only
No supplier on this page
When a partner is listed, it will be outbound and disclosed. Nothing to buy here. Fertilizer, soils, and pesticides stay off this slot.
What to record in the Field Book
Save the bed with the crop and the date. You may add a photo and notes. Compare entries you have recorded with each other — not with a diagnosis from this page. If you want an identification, bring the record to local Extension.
How we know — methodology. Ranges and assertions are cited per source, not blended.