Best Time to See Monarch Butterflies in South Dakota
August, September and July is the best time to see monarch butterflies in South Dakota. Based on 669 verified iNaturalist observations, here is exactly when monarch butterflies are most active across the year in South Dakota.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 28, 2026.
669 verified observations of monarch butterflies in South Dakota, recorded across 7 months of the year on iNaturalist.
When monarch butterflies are recorded in South Dakota
Peak month
August
210 records (31.4% of the year)
| Month | Observations | Share |
|---|---|---|
| January | 0 | 0% |
| February | 0 | 0% |
| March | 0 | 0% |
| April | 0 | 0% |
| May | 30 | 4.5% |
| June | 103 | 15.4% |
| Julypeak | 115 | 17.2% |
| Augustpeak | 210 | 31.4% |
| Septemberpeak | 193 | 28.8% |
| October | 17 | 2.5% |
| November | 1 | 0.1% |
| December | 0 | 0% |
Monarch Butterflies you are most likely to see
| Species | Verified observations |
|---|---|
| Monarch | 669 |
Weather to expect, source Open-Meteo
Typical weather in South Dakota
Recent typical conditions by month, so you can plan a trip around both when monarch butterflies are active and what the weather is doing. The best months to look for monarch butterflies sit around 58 to 87 degrees Fahrenheit, so pack for that.
| Month | Avg high | Avg low | Rain |
|---|---|---|---|
| Jan | 31°F | 16°F | 0.5" |
| Feb | 31°F | 11°F | 0.7" |
| Mar | 44°F | 25°F | 1.6" |
| Apr | 54°F | 34°F | 2.4" |
| May | 68°F | 49°F | 3.7" |
| Jun | 84°F | 63°F | 2.2" |
| Julbest time | 87°F | 67°F | 2.5" |
| Augbest time | 86°F | 66°F | 1.6" |
| Sepbest time | 78°F | 58°F | 2.1" |
| Oct | 58°F | 40°F | 2" |
| Nov | 46°F | 29°F | 0.8" |
| Dec | 35°F | 19°F | 1.3" |
Typical recent conditions (5-year means) from the Open-Meteo archive, averaged for South Dakota. Weather varies year to year, so treat these as a guide.
More on monarch butterflies in South Dakota:
Sightings of monarch butterflies in South Dakota peak in August, when 210 of the year's 669 verified observations are logged — about 31.4% of the annual total. Activity stays high through August, September and July.
The quietest stretch is January, February and March, when monarch butterflies are hardest to find — no verified records exist for January. If a reliable sighting matters, plan around the peak window rather than the off-season.
The monarch butterflies you are most likely to encounter in South Dakota are Monarch — the most-recorded species in the state. Each keeps its own seasonal rhythm, but the month-by-month pattern above reflects every reported sighting together.
Where to go
Best places to see monarch butterflies in South Dakota
- Badlands National Park — National Park
- Jewel Cave National Monument — National Monument
- Lewis & Clark National Historic Trail — National Historic Trail
- Missouri National Recreational River — National Recreational River
- Wind Cave National Park — National Park
- Minuteman Missile National Historic Site — National Historic Site
Frequently asked questions
What is the best month to see monarch butterflies in South Dakota?+
August is the single best month, and the broader peak window runs through August, September and July, based on 669 verified iNaturalist observations.
When are monarch butterflies hardest to see in South Dakota?+
January is the quietest month for monarch butterflies in South Dakota, with no verified records on iNaturalist.
Are monarch butterflies active year-round in South Dakota?+
Monarch butterflies are recorded in 7 of 12 months in South Dakota, concentrated around August and September.
More places to see monarch butterflies
More wildlife in South Dakota