When to plant in Yankton, SD
USDA Zone 5aYankton, South Dakota frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 5a, Yankton gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average first fall frost in Yankton is now 6 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
YANKTON 2 E · 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 Yankton’s own odds, recorded at YANKTON 2 E.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 18 | May 6 | Apr 24 | Sep 17 | Oct 1 | Oct 14 |
| 32°F | May 10 | Apr 27 | Apr 13 | Sep 27 | Oct 11 | Oct 23 |
| 28°F | May 2 | Apr 18 | Apr 3 | Oct 6 | Oct 21 | Nov 3 |
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 Yankton, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 32 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.
Yankton planting FAQ
When is the last spring frost in Yankton, SD?
On average, the last spring frost in Yankton is around April 27 (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 Yankton, SD?
The first fall frost in Yankton typically arrives around October 11 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Yankton in?
Yankton is in USDA hardiness zone 5a. In zone 5a, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Yankton?
Yankton has about 167 frost-free days — a moderate growing season — between the average last spring frost (April 27) and first fall frost (October 11).
When should I plant tomatoes in Yankton?
For Yankton, sow tomatoes indoors about March 2–March 16 and move the seedlings out around May 4, after the last spring frost.
Never miss a window in Yankton
An email when it’s time to start seeds, transplant, and sow — timed to Yankton’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Vermillion · 40 km
- Sioux Falls · 90 km
- Sioux City · 93 km
- South Sioux City · 93 km
- Norfolk · 96 km
- Le Mars · 100 km
- Brandon · 102 km
- Mitchell · 107 km
Frost dates recorded at YANKTON 2 E, 3 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 Yankton, SD — Frost Dates & Zone 5a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00094911. Retrieved from https://blissgarden.com/south-dakota/yankton.