Yes — Strong Match
calibrachoa is grown as an annual, so season length decides it here, not a winter zone — and South Dakota's typical season runs ~168 frost-free days against the ~60 calibrachoa needs.
Sow by about Aug 18
Calibrachoa is grown as an annual, so what decides it here is season length, not a winter zone. It needs about 60 frost-free days and a typical South Dakota season runs ~168 frost-free days, leaving 108 days of slack. That is room to sow as late as about Aug 18 and still finish before the usual first freeze (Oct 12).
Want more weeks at either end of that window? How to buy the weeks →
60 frost-free days required against South Dakota’s ~168-day season. NOAA Regional Climate Centers ACIS 1991-2020 (28°F killing freeze), state median across counties, via stateClimateData.ts.
Your yard isn't the whole zone.
Calibrachoa is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is. A typical South Dakota site runs ~168 frost-free days, but that is a state median, not your yard: slope, trees, and low spots move the last-frost date across a single parcel. Enter your address and we'll score calibrachoa against your land's actual frost dates, sun, and soil.
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Zone Comparison
Calibrachoa Needs
- USDA Zones: Data pending
- Frost-Free Days: 60+
- Sun: Full Sun
- Mature size: 6 in tall
- Picking window: ~150 days of harvest
- Drought tolerance: Medium
South Dakota Has
- USDA Zones: 4a-5b
- Last Hard Freeze (28°F): Apr 22 - Apr 29
- First Hard Freeze (28°F): Oct 9 - Oct 15
- Annual Rainfall: 14-26 inches
- Common Soils: Prairie loam, Clay, Sandy loam
Preferred Soil pH
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Calibrachoa in South Dakota
The frost window
Across South Dakota, the last spring hard freeze (28°F) clears between Apr 22 and Apr 29, and the first fall hard freeze lands between Oct 9 and Oct 15 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 163-day window you can count on — up to 176 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
When to start the seed
Those dates are when calibrachoa goes out, not when it starts. It is sown under cover about 12 weeks ahead, so counting back from South Dakota's late-side last freeze of Apr 29 is what fixes your sowing date — and a yard that clears frost earlier than the state's late date starts earlier still.
Days to maturity vs. the window
At 55 days to maturity (USDA PLANTS Database), counting from the last hard freeze it ripens with 108 days to spare even in South Dakota's tightest freeze scenario — room for a later start or a second sowing.
Timing tuned to sub-state frost dates — Lawrence County, not the statewide average.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
Frost-free days
Calibrachoa wants 60+ frost-free days; a typical South Dakota site sees ~168 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
Growing degree days
Calibrachoa needs ~1200 GDD (base 50°F) to ripen. The state median runs ~2356 GDD (from PRISM 1991-2020 climate normals), so South Dakota's typical season clears that easily.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Calibrachoa likes near-neutral soil (pH 5-6.5). That's the common-ground band across South Dakota's prairie loam and clay — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 5.5 and 6 — worth knowing before you decide whether a South Dakota soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your South Dakota site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Your land, not the state average
South Dakota soil pH runs about 6.7–7.2, and that sits above calibrachoa's tolerated 5–6.5, so the typical South Dakota parcel needs sulfur to bring it down. SSURGO maps it swinging by full points parcel to parcel, so your map unit, not the state number, decides whether calibrachoa needs lime or sulfur.
Check your parcel → Source: USDA NRCS SSURGO.
Plant pH and drainage requirements from USDA PLANTS Database. South Dakota soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Calibrachoa in South Dakota — Quick Answer
- Verdict: Yes — Strong Match
- Plant Zones: Data pending (USDA PLANTS Database)
- State Zones: 4a-5b (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Apr 22 - Apr 29 to Oct 9 - Oct 15 (NOAA Regional Climate Centers ACIS, 1991-2020)
- Days to Maturity: 55 days
What Else to Consider for Calibrachoa in South Dakota
Zone compatibility tells you about winter cold survival — but South Dakota growers also need to think about:
Extreme cold and short growing season
Low rainfall in western SD
Wind exposure on the open prairie
Growing calibrachoa here specifically
Calibrachoa does best acidic (pH 5.0–6.5); South Dakota soils average near pH 7.0, alkaline enough to yellow its leaves as micronutrients lock away.
Work in elemental sulfur or acidic organic matter to pull your parcel toward pH 5.0–6.5, then retest. How to handle it →
What to actually do about these — and the constraints that apply to every South Dakota grower, not just calibrachoa — is covered on the South Dakota growing guide.
Timing shifts within South Dakota
South Dakota isn't one climate. In Lawrence County, the last hard freeze (28°F) holds until about May 12 — roughly 17 days later than the recorded state median — so plant calibrachoa to your county's window, not the statewide date.
Calibrachoa needs about 60 days of frost-free season to complete its cycle. Even Lawrence County — South Dakota’s shortest season at 145 frost-free days — clears that by 85 days, so season length isn’t the constraint anywhere in South Dakota. What varies is your own parcel.
County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Calibrachoa's 60-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Pollinator + Wildlife Value
Calibrachoa draws honeybees, butterflies, and hummingbirds (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, calibrachoa can only work that bloom inside South Dakota's frost window — roughly 168 days, opening after the last 28°F freeze (Apr 22 - Apr 29) and closing at the first (Oct 9 - Oct 15), per NOAA Regional Climate Centers ACIS, 1991-2020.
Recommended Calibrachoa Varieties for South Dakota
South Dakota publishes no state variety trial for calibrachoa, so we won't invent a "best for South Dakota" list. Choose types rated to your USDA hardiness zone (4a-5b), and confirm winter survival and drainage against your own parcel.
South Dakota Cooperative Extension
For South Dakota-specific cultivar recommendations, planting calendars, and pest pressure for calibrachoa, the canonical source is SDSU Extension. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Calibrachoa native to South Dakota?
No — the USDA PLANTS Database lists Calibrachoa as introduced rather than native in the Lower 48, so it is not part of South Dakota's native flora. It grows here as a garden plant; pairing it with a few South Dakota natives keeps local pollinators fed too.
Looking for plants that belong here? The South Dakota growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Calibrachoa in South Dakota
When can I plant Calibrachoa in South Dakota?
South Dakota's last spring hard freeze (28°F) clears between Apr 22 and Apr 29, and the first fall hard freeze lands between Oct 9 and Oct 15 (NOAA Regional Climate Centers ACIS, 1991-2020). Time outdoor planting to after the last hard freeze for your specific site — a further two to three weeks for anything tender — and count back from those dates for transplant scheduling.
Can Calibrachoa mature before first frost in South Dakota?
Yes — Calibrachoa matures in 55 days (USDA PLANTS Database), and South Dakota's dependable hard-freeze-free window runs 163 days (NOAA Regional Climate Centers ACIS, 1991-2020), leaving 108 days of margin. Plant once the last hard freeze has passed — two to three weeks later for anything tender — and it ripens ahead of the first fall freeze.
What hardiness zone is Calibrachoa grown in across South Dakota?
South Dakota spans USDA hardiness zones 4a-5b (USDA ARS PHZM 2023). Calibrachoa carries a range of zones Data pending, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical South Dakota site have?
A typical South Dakota site sees ~168 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Calibrachoa needs 60+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date. In cooler counties like Lawrence, the freeze-free season runs shorter than the state average, so verify your own county's window.
Is Calibrachoa native to South Dakota?
No — the USDA PLANTS Database lists Calibrachoa as introduced rather than native in the Lower 48, so it is not part of South Dakota's native flora. It grows here as a garden plant; pairing it with a few South Dakota natives keeps local pollinators fed too.
How should I amend the soil for Calibrachoa in South Dakota?
Calibrachoa prefers pH 5-6.5 and well (dry spells) drainage (Growable Ground Plant Database). That sits in the common-ground band across South Dakota soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Calibrachoa actually grow on my specific land in South Dakota?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores calibrachoa against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in South Dakota
State-level data is a sketch. Your Growable Ground report scores calibrachoa against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that South Dakota calibrachoa averages can't show:
We read public map data around South Dakota — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the South Dakota calibrachoa average
Explore More
Growing guides for calibrachoa
Analysis by the Growable Ground research team, grounded in USDA PLANTS, USDA NRCS SSURGO, NOAA Climate Normals (1991-2020), and named Cooperative Extension sources. How we know →
Cite this dataset
Kirchick, M. (2026). Growable Ground Plant Database [Data set]. Zenodo. https://doi.org/10.5281/zenodo.21435643
Licensed CC BY-NC 4.0. DOI 10.5281/zenodo.21435643
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