When to plant in Rapid City, SD
USDA Zone 5bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Rapid City, South Dakota — all computed from Rapid City's nearest NOAA weather station.
In zone 5b, Rapid City gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
Frost probability
RAPID CITY WFO · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Rapid City’s own odds, recorded at RAPID CITY WFO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 29 | May 15 | May 1 | Sep 19 | Oct 1 | Oct 14 |
| 32°F | May 17 | May 3 | Apr 20 | Sep 26 | Oct 8 | Oct 23 |
| 28°F | May 5 | Apr 22 | Apr 8 | Oct 3 | Oct 18 | Nov 1 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Rapid City, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Rapid City planting FAQ
When is the last spring frost in Rapid City, SD?
On average, the last spring frost in Rapid City is around May 3 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Rapid City, SD?
In Rapid City, the first 32°F freeze of fall lands around October 8 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Rapid City in?
Rapid City is in USDA hardiness zone 5b. In zone 5b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Rapid City?
Rapid City has about 158 frost-free days — a moderate growing season — between the average last spring frost (May 3) and first fall frost (October 8).
When should I plant tomatoes in Rapid City?
For Rapid City, sow tomatoes indoors about March 8–March 22 and move the seedlings out around May 10, after the last spring frost.
Never miss a window in Rapid City
An email when it’s time to start seeds, transplant, and sow — timed to Rapid City’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at RAPID CITY WFO, 1 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Rapid City, SD — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00396948. Retrieved from https://blissgarden.com/south-dakota/rapid-city.