Should I Bring Mums In For Frost?

Short Answer

If you live in a region where frost arrives early and you have limited indoor space, bringing mums inside can extend their display, but be cautious of temperature shocks, limited light, and potential disease. Consider it when the forecast predicts a hard freeze within a week and you can provide cool, bright conditions; avoid it if you lack suitable indoor conditions or the plants are already stressed.

When It Makes Sense

• Good fit: You have a sunny, cool room (50‑55°F / 10‑13°C) and the frost warning is imminent, allowing you to move the plants quickly before damage occurs.
• Good fit: Your mums are in large containers that can be easily relocated and you plan to keep them for a second-season bloom or as cut flowers.

When You Should Avoid It

• Warning sign: The indoor space has low light, high heat, or poor air circulation, which can cause leggy growth or fungal problems.
• Warning sign: The mums are already wilting, pest‑infested, or suffering from root rot; moving them may spread disease indoors.

Pros and Cons

Pros

• Protects the plant from cellular damage caused by sub‑freezing temperatures, preserving foliage and flower buds.
• Extends the visual display into late fall or early winter, allowing continued enjoyment or use as cut flowers.

Cons

• Indoor environments often lack the bright, cool light mums need, leading to weak growth or premature fading.
• Potting medium can become soggy if watering is not adjusted, raising the risk of root rot and fungal disease.

Decision Checklist

• Do I have a bright, cool indoor area (around 50‑55°F) where the mums can stay for several weeks?
• Can I provide adequate ventilation and adjust watering to prevent excess moisture?
• Are the plants healthy enough to tolerate the stress of moving and a change in environment?

Alternatives to Consider

If indoor conditions are unsuitable, you might cover the mums with frost cloth, a cold frame, or a temporary greenhouse structure. Another option is to prune back the foliage to a manageable size and mulch heavily around the base to insulate the roots while leaving the plant outdoors.

Final Recommendation

Bring mums indoors for frost only when you can replicate a cool, bright, well‑ventilated environment and the plants are healthy. Otherwise, use frost‑protective covers or cold frames to shelter them outdoors. For high‑stakes decisions—especially in commercial or rare‑variety situations—consult a horticultural specialist or local extension service.