When to Plant Cauliflower in Oklahoma

Growing Cauliflower in Oklahoma: Complete Guide

Cauliflower (Brassica oleracea var. botrytis) is a warm-season crop that needs a head start indoors before Oklahoma's last frost. Most Oklahoma gardeners begin seeds indoors around Sunday, February 22, 2026 and move transplants outside around Sunday, April 5, 2026, after the risk of frost has passed.

Because Oklahoma stretches across 4 USDA hardiness zones (6b, 7a, 7b, 8a), planting windows can shift by as much as two to four 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, Cauliflower needs the indoor head start that Oklahoma's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.

Cauliflower requires full sun (6 hours) and regular (1-1.5 inches/week) moisture. Great Plains gardens face strong winds and variable moisture — windbreaks and drip irrigation help significantly.

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 Oklahoma.