Roseburg, OR Frost Dates
Average frost dates, USDA hardiness zone, and growing season length for Roseburg, Oregon.
Gardening in Roseburg
The Umpqua Valley sits between the Cascades and the Coast Range, creating a warm valley that grows excellent food and wine.
Zone 8a with 232 frost-free days. The Umpqua Valley's warmth and shelter produce conditions that rival the Willamette Valley. Volcanic soil is naturally productive.
The Umpqua Valley's emerging wine country proves the growing conditions rival Oregon's more famous valleys.
What This Means for Roseburg Gardeners
The average last spring frost in Roseburg is around March 18, and the average first fall frost arrives around November 5. That gives you approximately 232 frost-free days to work with.
That's a generous season. You have time for full-size tomatoes, long-season peppers, and even watermelons without the anxiety of racing the frost. Start warm-season seeds indoors 6-8 weeks before your last frost to hit the ground running. Fall planting is your second opportunity — garlic, kale, lettuce, and broccoli all go in 8-10 weeks before your first frost for harvest into late autumn.
These dates are based on NOAA 30-year Climate Normal data for the Roseburg area. Your actual frost dates could shift 2-3 weeks in either direction in any given year. Learn more about our data sources.
What to Grow in Roseburg
Roseburg's 232-day growing season is generous — long enough for two full growing windows (spring and fall) with warm-season crops between them. You can grow the full range of vegetables, herbs, and flowers with proper timing. Focus on heat-tolerant varieties for midsummer and cool-season crops for extended fall harvests. Recommended starting points: tomatoes, peppers, beans, cucumbers, squash, garlic, kale, and sunflowers.
See the full Oregon planting guide for all 40 plants: Oregon Planting Calendar. Or enter your zip code for exact planting dates personalized to Roseburg.
More About Zone 8A
Roseburg is in USDA Hardiness Zone 8A, which means average annual extreme minimum temperatures between 10°F to 15°F. View the full Zone 8A planting guide.
See the complete planting calendar for Oregon: Oregon Planting Calendar.
Other Cities in Oregon
Frequently Asked Questions
These dates are based on NOAA's 30-year Climate Normal data for the Roseburg area. They represent historical averages, not predictions. In any given year, the actual last frost could be 2-3 weeks earlier or later. Microclimates within Roseburg (urban heat islands, hilltops, low-lying valleys) can also shift your local frost dates by a week or more.
Cool-season crops go in 3-4 weeks before your last frost (March 18). Warm-season crops wait until 2 weeks after. You have time for a fall round too — plant cool-season crops again in late summer for harvest into autumn. Enter your zip code for exact dates.