Planting timing
When to plant zucchini
Plant zucchini on the cited sheets — not on a national calendar month. Frost, soil, and regional dates 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 and soil notes stay on the named cards below — not one planting window.
Spacing lives on the zucchini hub. Timing stays on the cited sheets.
Types and spacing live on growing zucchini.
What the sources say — at a glance
One source per card. Facts are not averaged.
Clemson HGIC 1321 (South Carolina)
After last chance of frost. Soil 60 °F at 4 in. Piedmont Apr 15–Jul 31 / Jul 15–Aug 15. Coastal Mar 15–Jul 31 / Aug 1–Aug 31.
Details and limits (3)
When
Clemson HGIC 1321 (South Carolina): do not plant until after the last chance of frost has passed, and the soil temperature is 60 °F, 4 inches below the surface. Static named-source frost and soil-temperature notes — not a national plant date.
When
Clemson HGIC 1321 (South Carolina): Piedmont spring April 15 to July 31; fall July 15 to August 15. Coastal spring March 15 to July 31; fall August 1 to August 31. South Carolina regions — not a national plant date.
Limit
South Carolina HGIC 1321, summer squash including zucchini. Piedmont and Coastal dates stay on this sheet. Not one BioArva calendar and not a ZIP tool.
Maryland Extension (Maryland)
After frost and soil warmed. Second crop July 1–15.
Details and limits (2)
When
Maryland Extension (Maryland): sow seed directly into the garden after the danger of frost has passed and soil has warmed. Plant a second crop July 1–15. Maryland timing — not a national plant date.
Limit
Maryland summer-squash (zucchini) sheet. July 1–15 second crop stays Maryland. Not one BioArva calendar and not a ZIP tool.
UMN Extension (Minnesota)
Late May to early June. After last frost. Soil at least 70 °F at 2 in.
Details and limits (2)
When
UMN Extension (Minnesota): sow seed directly in the garden after the soil has warmed, in late May to early June. Sow after the last frost date, once soil temperatures are at least 70 °F at the two-inch depth. Minnesota timing — not a national plant date.
Limit
Minnesota summer-squash and zucchini sheet. Late May to early June and 70 °F stay Minnesota. Not one BioArva calendar and not a ZIP tool.
Illinois Extension (Illinois)
After danger of frost, early spring until midsummer. Two plantings.
Details and limits (2)
When
Illinois Extension (Illinois): plant any time after the danger of frost has passed, from early spring until midsummer. Some gardeners have two main plantings — one for early summer harvest and another for late summer and fall harvest. Illinois timing — not a national plant date.
Limit
Illinois summer-squash page. Early-spring-until-midsummer stays Illinois. 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.
When do you plant zucchini?
Compare dates on the cited sheets. Clemson HGIC 1321 (South Carolina): after the last chance of frost; soil 60 °F at 4 inches. Maryland: after frost and soil warmed; second crop July 1–15. Minnesota: late May to early June; soil at least 70 °F at 2 inches. Illinois: after danger of frost, early spring until midsummer.
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.