Gibbon River Fly Hatch Chart

The Gibbon River is divided by several major waterfalls along its course. Each section of the river supports a unique fishery and provides excellent fly fishing opportunities. As good as the fishing can be, trout on the Gibbon can be finicky feeders and matching the hatch is critical.

gibbon river fly hatch chart

Gibbon River Hatch Chart

The following hatch chart for Gibbon River identifies the major fly hatches, recommended fly sizes by hatch, and peak hatch dates. Hatch dates may vary from year to year and are influenced by water conditions.

Fly HatchSizeDate
Midges18–22May 15 - Nov 15
Little Blue-winged Olive18–24May 25 - June 30; Sep 1 - Oct 15
Blue-winged Olive16–24May 25 - June 30; Sep 1 - Oct 15
Little Black Caddis (American Grannom)16–18May 25 - June 10
Little Sister Caddis18–22June 25 - Aug 31
Golden Stonefly6–10June 20 - July 30
Green Drakes14–16June 20 - July 15
Brown Drakes10–12June 20 - July 15
Spotted Sedges14–16June 20 - Aug 15
Ants16–18June 15 - Sep 30
Yellow Sally14–16June 15 - July 15
Salmonfly2–8June 10 - July 15
Blue-winged Red Quills14-16June 1 - June 30
Pale Morning Duns (PMDs)16–20June 1 - Aug 31
Longhorn Sedge16July 15 - July 31; Sep 20 - Oct 15
March Browns10–14July 15 - Aug 31
Mahogany Duns14–18July 15 - Aug 15
Little Brown Caddis18July 15 - Aug 15
Crickets12–16July 1 - Sep 30
Beetles14–18July 1 - Sep 30
Green Sedges14–18July 1 - Oct 31
Grasshoppers10–14July 1 - Oct 31
Little Black Short Horned Sedges20–22July 1 - July 30

Major Fly Hatches on the Gibbon River

Fly hatches along the Gibbon River are abundant throughout the spring and summer, with a few hatches extending into late fall. Major hatches consist of mayflies, caddis, and stoneflies.

On the section of the Gibbon River between Norris and Gibbon Meadows, Brown Trout in the 8″ to 20″ range are the predominate fish. Matching the hatch here is critical. Brown and Green Drake, as well as PMD, are the major hacthes along this stretch.

From Gibbon Meadows to Gibbon Falls stonefly and caddis are the predominant hatches. Attractor dry flies that mimic small stoneflies or larger caddis are most productive.

Along the lower 5 mile stretch from Gibbon Falls to Mouth, nymphing is going to be most productive. A stonefly nymph with a small caddis dropper is going to catch you as many fish as anything else. For dry flies, general attractors or terrestrials are your go-to patterns.

During fall nymphing or streamer fishing is the most productive technique to generate consistent bites. Anglers report that fishing a stonefly trailed by a baetis nymph is an effective presentation.

Where you find cold, swift, boulder strewn, pocket water environments along the Gibbon River you may also find Salmonflies. Salmonfly hatches are most prolific during the months of June and July. Anglers should always keep a salmonfly pattern or two handy just in case they happen upon a hatch.

For dry fly enthusiasts one of the best stonefly patterns for fishing the Gibbon River during early summer is a #14-16 Olive Stimulator. If you’re nymphing try a #16 Oliver Montana Princes (Prince Nymph).