Seasonal Action Guide
How to Overwinter Rosemary and Tender Perennial Herbs
The short answer
In regions where rosemary is not winter-hardy, grow it in a pot and bring it indoors before hard frost, ideally 2 to 3 weeks before your first fall frost date. Give it the brightest spot you have, such as a south-facing window or supplemental light, with good air circulation and cool room temperatures.
The biggest risks indoors are too little light and improper watering. Let rosemary dry slightly between waterings; it is prone to root rot in wet, poorly drained soil, so a clay pot that dries quickly helps. Move it back outdoors after frost danger passes in spring.
Timing and location
- Pot up tender rosemary and bring it in 2 to 3 weeks before the first fall frost
- Place in a south-facing window in full sun, or use supplemental lighting
- Keep good airflow and avoid hot, dry drafts
- Move back outside once spring frost danger has passed
Watering and drainage
Let rosemary dry out slightly between waterings. It is sensitive to wet, poorly drained soil, and overwatering causes root rot. Clay pots dry faster and reduce that risk.
⚠ Overwintering rosemary indoors is tricky; low light plus too much water (root rot) are the usual causes of failure.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- Penn State Extension — Herb garden plants: rosemary — Where not hardy, grow rosemary in pots taken indoors 2-3 weeks before the first fall frost; give full sun and let it dry between waterings.
- University of Maryland Extension — Care of herbs and starting herbs from seed — Bring tender herbs indoors before hard frost to a cool spot with good light and air circulation.
- University of Wisconsin Horticulture — Rosemary, Salvia rosmarinus — Rosemary is sensitive to overwatering and root rot; overwintering indoors needs bright light and careful watering.
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