When to Plant Zinnias in Vermont
The cut-and-come-again champion. The more you cut zinnias, the more they bloom. A cottage garden essential.
The Short Answer
Vermont Frost Dates
Your planting dates depend on which part of Vermont you're in. Here are the frost date ranges by region:
| Region | Zones | Last Frost (Spring) | First Frost (Fall) |
|---|---|---|---|
| Northern Vermont | 3b, 4a | May 20 - Jun 5 | Sep 5 - Sep 20 |
| Central Vermont | 4a, 4b, 5a | May 10 - May 25 | Sep 15 - Oct 1 |
| Southern Vermont | 4b, 5a, 5b | May 5 - May 20 | Sep 20 - Oct 5 |
Zinnias Planting Schedule for Vermont
Northern Vermont (Zones 3b, 4a)
Average last frost: May 20 - Jun 5 · Average first frost: Sep 5 - Sep 20
Central Vermont (Zones 4a, 4b, 5a)
Average last frost: May 10 - May 25 · Average first frost: Sep 15 - Oct 1
Southern Vermont (Zones 4b, 5a, 5b)
Average last frost: May 5 - May 20 · Average first frost: Sep 20 - Oct 5
Growing Zinnias in Vermont
Zinnias in Vermont's Climate
Zinnias are one of the best annual cut flowers for cold climates — they grow fast enough to bloom for months even in short seasons. Direct sow after your last frost when soil reaches 60°F. The more you cut, the more they bloom, producing armloads of color from July through first hard frost.
Soil Considerations for Vermont
Rocky, acidic soils typical of New England. Glacial deposits. Thin mountain soils. Raised beds very popular. Make sure soil has warmed to at least 60°F before planting zinnias outside.
Vermont Climate & Growing Season
Short growing season. Cold winters. Cool summers. Long summer days help compensate. Season extension techniques valuable. Zinnias cannot tolerate any frost, so wait until all frost danger has passed before transplanting outside. Watch local forecasts carefully in spring.
Growing season length varies across Vermont: Northern Vermont (3b, 4a) has a last frost around May 20 - Jun 5, while Southern Vermont (4b, 5a, 5b) sees frost end around May 5 - May 20. This difference matters for zinnias — transplant timing shifts by several weeks across the state.
Growing Tips
Water at the base to prevent powdery mildew. Cut flowers just above a leaf node to encourage more branching and blooms.
Companion Planting
Plant zinnias alongside these companions for better growth:
The Bottom Line
Last reviewed: March 29, 2026