The March Brown is one of the UK's most iconic spring upwing flies and is particularly associated with fast-flowing, stony rivers. Although never as widespread as the Large Dark Olive, it is a hatch that every river angler should recognise. When conditions are right, trout can become highly focused on these large, easily seen insects, producing some of the finest early-season dry fly fishing of the year.
March Browns are most commonly found on freestone rivers in northern England, Scotland and parts of Wales. They favour clean, well-oxygenated water with gravel and stone riverbeds, where the nymphs spend much of their lives clinging to rocks in faster currents. Unlike agile swimming olives, March Brown nymphs are adapted to life in broken water and are often dislodged during periods of increased flow.
The hatch usually occurs throughout March and April, although exact timing varies depending on river temperature and local conditions. Unlike some prolonged summer hatches, March Brown activity can be quite short-lived, often lasting little more than an hour during the warmest part of the day. Because of this, anglers should remain observant and be prepared to change tactics quickly when the hatch begins.
Before the hatch, trout frequently feed on nymphs drifting close to the riverbed. As insects begin emerging, fish often switch to taking emergers trapped in the surface film before moving confidently onto the freshly hatched duns. Spinner falls are generally of less importance than with many later upwing flies, so anglers should concentrate on the nymph, emerger and dun stages.
The March Brown is a relatively large upwing fly, making it much easier to see than many summer olives. Trout often rise confidently, giving anglers the opportunity to target individual fish with accurate presentations. As always, a drag-free drift remains the key to success, particularly on broken currents where conflicting flows can quickly introduce drag.
At Peaks Fly Fishing, we always look forward to the March Brown hatch on our northern rivers. Although it may not receive the attention of the famous Mayfly hatch, it regularly produces superb fishing for wild brown trout. Carrying a few dedicated March Brown patterns alongside reliable nymphs will prepare you for one of spring's most enjoyable hatches.
## Recommended Fly Patterns
### Nymphs
* Pheasant Tail Nymph
* March Brown Nymph
* Hare's Ear Nymph
### Emergers
* Pheasant Tail Klinkhammer
### Duns
* March Brown
* March Brown Stacked Hackle
### Alternatives
* Hare's Ear F-Fly
* Parachute Adams
* Pheasant Tail Nymph
## Peaks Fly Fishing Tips
* Look for the hatch during the warmest part of the day.
* Concentrate on fast, well-oxygenated freestone rivers.
* Be ready to change quickly from nymph to dry fly as the hatch develops.
* Fish the seams and softer water below faster runs where trout intercept emerging insects.
* Don't overlook the March Brown just because the hatch is relatively short - when it happens, it can produce outstanding dry fly fishing.
