How long do marigold seeds take to germinate?
Marigold seeds sprout in 5-10 days at an optimal soil temperature of 70-75 °F. Use the planner to estimate days and a sprout date for your soil temperature.
Quick answer
Germination planner
Temperature range & printable card
Notes & troubleshooting
An easy, fast warm-season flower. Start indoors 4-6 weeks before the last frost or direct-sow after frost. Cover seed lightly (about 1/8 in).
If they will not sprout
- Too deep: marigold seed is small; sow shallow (~1/8 in) or it struggles to emerge.
- Damping off: avoid soggy, cold media.
- No sprouts after 2 weeks: check soil temperature is at least ~65 F.
Sources & how the planner works
The germination range (65-85 °F), optimal band (70-75 °F), 5-10 days to germinate, and 1/8 in sowing depth are curated from the sources below and last reviewed 2026-06-18.
The germination planner is DETERMINISTIC interpolation over the cited temperature ranges, not a prediction model. Below the minimum soil temperature, seeds are flagged as unlikely to germinate (and may rot); within the optimal band they sprout fastest (toward the low day count); between minimum and optimal they sprout slower (toward the high day count); above the maximum, germination drops or seeds go dormant. The 'sow date -> sprout window' is simply the sow date plus the expected day range for the chosen temperature band. It is general guidance, not a zone-based planting calendar.
General seed-starting guidance only. Soil temperature (not air temperature) drives germination; use a soil thermometer for best results. Verify timing for your specific variety and region; extension services publish local recommendations.