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Herbs, Flowers & Specialty CropsRosemary Planting Calendar
Rosemary rewards a good site and punishes a wet winter. Your plan depends on whether your climate lets it live outdoors all year or whether you will treat it as a tender perennial.
Key points
- Check your hardiness zone first; rosemary is a tender perennial in colder areas.
- Plant after frost danger, in full sun and very well-drained soil.
- Wind and winter wet harm plants more than cold alone.
- Pots let you move plants to shelter before hard freezes.
Can rosemary survive winter where you live?
University of Nebraska-Lincoln Extension reports that rosemary is winter hardy in USDA Zones 7 through 10, and that most of Nebraska, in Zones 4b through 6a, treats it as a tender perennial. Gardeners there usually grow it as an annual or as a houseplant, although some protected sites can carry plants over with extra care.
The USDA Plant Hardiness Zone Map describes average annual minimum winter temperature, which is the right tool for this question. It does not give frost dates or planting dates, so you also need local frost information.
When should you plant rosemary?
Set out plants in spring after the last frost, once nights are consistently mild. This gives roots a full season to grow before winter. In mild regions, fall planting can also work, as long as roots have time to establish.
Rosemary seed is slow and erratic, so most growers buy plants or root cuttings from healthy stems. If you want a cold-hardy type, ask a local nursery or extension office for named choices known to survive in your area.
If you plan to carry plants over winter in a pot, plant them into a container in late summer or early fall so roots have time to adjust before you bring them inside.
What site and soil does rosemary need?
The Nebraska source describes a sunny, sheltered spot with very well-drained, dry, slightly acidic, almost gravelly soil. Poorly drained winter soil is the biggest threat because it causes root rot. A site beside a south or west wall can add warmth.
If your soil is heavy, plant in a raised bed or large container. Test soil and follow local recommendations on amendments, and remember that nutrient management rules vary by state.
Slightly acidic soil is what the source recommends, so have your soil tested for pH before planting. Your extension office can interpret results and suggest local options.
How do you protect rosemary through winter?
In the cold end of its range, the Nebraska source suggests mulching the root zone with wood chips in fall, shielding branches from drying winter wind, and installing protection after the first hard frost, then removing it in spring only after frost danger has passed.
Wind and wet cause more damage than cold alone. Protection that lets air move but breaks the wind, such as burlap or a cage filled with leaves, tends to work better than airtight covers.
Do not prune hard in fall. Late pruning stimulates tender growth that frost can damage. Wait until spring, once frost danger has passed.
- Mulch roots after the first hard frost in colder areas.
- Break wind with breathable protection, not sealed covers.
- Remove protection only after frost danger has passed.
- Keep soil on the dry side through winter.
How do you grow rosemary in a pot or indoors?
Potted rosemary can be moved to shelter before frost. Use a pot with drainage holes and a fast-draining mix. Indoors, give it the brightest window you have, cool conditions if possible, and water only when the mix is partly dry.
Bring pots in after a light frost has hardened them off but before a hard freeze, and move them back outside gradually in spring.
Indoors, dry heated air favors spider mites. Grouping plants away from heating vents and keeping air moving helps.
How do you prune and harvest rosemary?
Harvest stem tips lightly in the first year, then more freely as the plant grows. Prune after flowering or in spring to keep the shape, and avoid cutting into old bare wood, which may not regrow.
Rosemary flowers attract bees. If you dry rosemary, use tested guidance from the National Center for Home Food Preservation or your extension office.
Replace plants that have become very woody and sparse. Fresh cuttings root in a few weeks and keep the planting vigorous.
What problems should you watch for?
Root rot from wet soil, powdery mildew in humid, crowded conditions and spider mites on dry indoor plants are the common issues. Good air flow, correct watering and clean plants prevent most trouble.
If you consider any pesticide, the label is the law, pre-harvest intervals apply and applicator licensing varies by state. Ask your extension office for current recommendations.
Keep a simple log of winter lows and what protection you used. Over a few years you will know how reliable your site is.
Timing at a glance
| Item | Window | Caveat |
|---|---|---|
| Rosemary winter hardiness, as reported by University of Nebraska-Lincoln Extension | Winter hardy in USDA Zones 7 to 10; treated as tender in colder zones | Zones describe winter minimum temperature only, not frost or planting dates; protected sites may differ. |
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.