When to Plant Zinnia in Oregon

Growing Zinnia in Oregon: Complete Guide

Zinnia (Zinnia elegans) is a crop that grows best when sown directly in the garden. In Oregon, the right time to direct sow is around Sunday, March 22, 2026, once soil temperatures are consistently warm enough for germination.

Because Oregon stretches across 9 USDA hardiness zones (5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b), 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 60 days to maturity, Zinnia fits comfortably within Oregon's growing season in most zones. In the warmest parts of the state, a second planting later in the season may be possible.

Zinnia requires full sun (6-8 hours) and moderate (1 inch/week) moisture. The Pacific Northwest's cool, wet springs delay soil warm-up; raised beds and black plastic mulch help jump-start the season.

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 Oregon.