When to Plant Celery in Idaho

Growing Celery in Idaho: Complete Guide

Celery (Apium graveolens) is a warm-season crop that needs a head start indoors before Idaho's last frost. Most Idaho gardeners begin seeds indoors around Wednesday, February 4, 2026 and move transplants outside around Wednesday, April 29, 2026, after the risk of frost has passed.

Because Idaho stretches across 8 USDA hardiness zones (4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b), 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 130 days to maturity, Celery needs the indoor head start that Idaho's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.

Celery requires full sun and regular moisture. Most of Idaho 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 Idaho.