When to plant rosemary in Salt Lake City, Utah
March 31 – April 14
Transplant outdoors · typical Salt Lake City yearClimate basis: NOAA station Salt Lake Triad Ctr, UT (USC00427606), 1 mi (2 km) from downtown Salt Lake City (ZCTA 84111 centroid), elevation 4280 ft, on the 1991–2020 climate normals. Transplant rosemary outdoors from approximately the dates above, anchored to the median last spring 32°F freeze (March 31). One year in ten still freezes after April 19.
The Salt Lake City year
- indoors under lights
- in the garden
- frost-free season
- 1-in-10 years still freeze to Apr 19
Every method, with its sources
Transplant outdoors
Mar 31 – Apr 14Oklahoma State Table 1: plant rosemary after the last spring frost (propagated by seed or cuttings; most gardeners set out purchased plants). Point rule given a 14-day span. Anchored to the median last spring freeze (Mar 31). Oklahoma State University Extension
Start seeds indoors
Not calculatedSeed-started rosemary is slow and erratic; the cited guide gives no indoor lead time, so no window is calculated.
Direct-sow outdoors
Not calculatedThe cited extension guides do not time direct sowing for this crop.
Fall planting
Not calculatedNo source-backed fall planting rule exists for this crop in the registry, so no fall window is calculated.
Variety assumption: A slow-growing perennial; harvest lightly the first season. Not reliably winter-hardy in cold zones.
These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.
Crop rule sources (1)
- Oklahoma State University Extension: Culinary Herbs for Oklahoma Gardens: Culture, Use and Preservation (accessed 2026-07-24)Table 1 planting times relative to last spring frost for common herbs.