Wildlife
The largest bighorn sheep herd in the lower 48, plus elk, mule deer, bald eagles and — below Judith Landing — growing numbers of bears.
Season by season
| Season | Window | Conditions |
|---|---|---|
| Spring | May – June | High, silty snowmelt water and fast flows; daytime highs in the 50s–60s. |
| Summer | July – August | Intense heat (90–100°F+), falling water and afternoon thunderstorms. |
| Autumn | September – October | Stable weather, clear skies and cool nights — a favorite window. |
| Winter | November – April | The river can freeze; sub-zero temperatures and wind make travel dangerous. |
Water conditions
The Missouri runs heavily silted. Settle the sediment with alum before filtering, or carry all your drinking water from the launch. Check BLM flow advisories before committing.