When to Plant Celosia in Illinois

Growing Celosia in Illinois: Complete Guide

Celosia (Celosia argentea) is a warm-season crop that needs a head start indoors before Illinois's last frost. Most Illinois gardeners begin seeds indoors around Wednesday, March 4, 2026 and move transplants outside around Wednesday, April 22, 2026, after the risk of frost has passed.

Because Illinois stretches across 5 USDA hardiness zones (5a, 5b, 6a, 6b, 7a), planting windows can shift by as much as six to eight weeks from one end of the state to the other. Gardeners in the warmer southern zones can start earlier, while those in cooler northern zones should wait until the zone table above shows their last frost has passed.

With 75 days to maturity, Celosia needs the indoor head start that Illinois's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.

Celosia requires full sun (6-8 hours) and moderate (1 inch/week) moisture. Most of Illinois receives adequate sunlight during the growing season, though gardeners in humid eastern regions should watch for fungal issues and ensure good air circulation.

For the most precise planting dates tailored to your exact location, enter your ZIP code on our planting calendar or use the zone table above to find the schedule for your area of Illinois.