When to Plant Zinnias in New Mexico
The cut-and-come-again champion. The more you cut zinnias, the more they bloom. A cottage garden essential.
The Short Answer
New Mexico Frost Dates
Your planting dates depend on which part of New Mexico you're in. Here are the frost date ranges by region:
| Region | Zones | Last Frost (Spring) | First Frost (Fall) |
|---|---|---|---|
| Northern New Mexico | 4a, 4b, 5a, 5b | May 5 - May 25 | Sep 15 - Oct 5 |
| Central New Mexico (Albuquerque) | 7a, 7b | Apr 1 - Apr 20 | Oct 15 - Nov 5 |
| Southern New Mexico | 7b, 8a, 8b | Mar 15 - Apr 5 | Oct 25 - Nov 15 |
Zinnias Planting Schedule for New Mexico
Northern New Mexico (Zones 4a, 4b, 5a, 5b)
Average last frost: May 5 - May 25 · Average first frost: Sep 15 - Oct 5
Central New Mexico (Albuquerque) (Zones 7a, 7b)
Average last frost: Apr 1 - Apr 20 · Average first frost: Oct 15 - Nov 5
Southern New Mexico (Zones 7b, 8a, 8b)
Average last frost: Mar 15 - Apr 5 · Average first frost: Oct 25 - Nov 15
Growing Zinnias in New Mexico
Zinnias in New Mexico's Climate
Zinnias grow in subtropical zones but face more disease pressure than in drier climates. Plant during the drier months and choose disease-resistant varieties like Profusion and Zahara. In humid Florida conditions, powdery mildew and bacterial leaf spot are aggressive — the Profusion series was specifically bred to resist these.
Soil Considerations for New Mexico
Alkaline desert soils. Low organic matter. Caliche layers common. Heavy amendment with compost essential. Make sure soil has warmed to at least 60°F before planting zinnias outside.
New Mexico Climate & Growing Season
High desert climate. Intense sun. Low humidity. Wide temperature swings day to night. Irrigation essential. 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 New Mexico: Northern New Mexico (4a, 4b, 5a, 5b) has a last frost around May 5 - May 25, while Southern New Mexico (7b, 8a, 8b) sees frost end around Mar 15 - Apr 5. 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