Winter fishing on the Jefferson River is typically slow, even with mild temperatures in the 40s and 50s. With lower trout densities than nearby rivers, patience and a slow nymphing approach are essential. Better fishing opportunities usually arrive in early spring, making late winter a tough—but possible—option for dedicated anglers.
Here is the latest report by Montana Angler from February 13, 2026:
Even with temps in the 40s and 50s, the Jefferson will still be a so-so option. The Jefferson has lower fish counts than other nearby rivers, so winter time on the Jefferson River leaves a lot to be desired.
If you do buck conventional wisdom and head to the Jefferson, concentrate on the bigger runs below riffles and experiment until you find the right water speed and depth. Nymphing will be the best producer, and as a rule expect very slow and subtle strikes so make sure to set the hook on even small disturbances to your indicator. Slow swimming a streamer across these runs can also produce some monsters but probably less overall action. A big sculpin or wooly bugger is a good choice as a top fly when nymphing and a prince or pheasant tail will do just fine as a dropper.
The Month Ahead:
Still not deal. Wait till April.
Long Term Fishing Forecast:
The Jefferson is not known as a winter fishery, but some good spring fishing over the skwala stonefly can be had in the early spring.
