Winter Greenhouse Gardening: Heating, Plant Selection, and Snow Management

Extend Your Growing Season

A greenhouse lets you overwinter plants and start spring early—but winter success depends on your climate, plant choices, and heat strategy.

1. Assess Your Climate

• Harsh winters (snow, deep freezes): difficult and costly to heat.
• Mild winters (occasional near-freezing nights): manageable with simple measures.

2. Choose Cold-Tolerant Plants

Overwinter hardy plants that handle cool temps. Tropicals will not survive in an unheated winter greenhouse.

3. Understand Temperature Dynamics

• Daytime: 20–40°F warmer than outside.
• Nighttime: Drops to near outside temp—this is the danger zone.

4. Heat Strategies

• Passive thermal mass: Large rocks or water barrels absorb day heat, release at night. Works for mild dips (50–60°F).
• Electric greenhouse heaters: For freezing nights. Choose models with thermostats, auto on/off, and long-run safety.

5. Snow Management

• Remove snow promptly—blocks solar gain, risks roof collapse.
• Brush off regularly, even if not in use.

With planning and the right setup, winter greenhouse gardening is absolutely achievable, especially in milder zones.