Protecting Container Plants from Frost in the San Francisco Bay Area

Frost Protection Principles

Nighttime lows in low 30s threaten succulents and potted plants near house. Key: Cover plants so frost doesn't touch tissue. Air gap between cover and plant is essential.

Methods

• Frame + cover: Build small tent over pots with stakes. Use burlap, frost cloth, or plastic (remove during day).
• Floodlights: Set up 1–2 outdoor floodlights on at night; radiant heat prevents frost formation.
• Cotton remnants: Your current method works if tented.

What to Avoid

Heavy covers that break stems. Plastic touching leaves transfers cold. Sealants for pavers are toxic and often illegal.

Uncover during daytime warmth. This simple routine works well for Bay Area marginal frosts.