Farmington River Fly Hatch Chart

Farmington River hatch chart listing the major fly hatches occurring along the Farmington River system in northcentral Connecticut. Hatch species, dates and emergence patterns may vary with annual changes in water flows and weather conditions.

farmington river ct fly hatch chart

Mayfly, stonefly and caddisfly flies go through three stages: Nymph (Larvae), Pupae/Emergence, and Adult. The hatch date reflects the transitional period from nymph to adult which may last from a few hours to a few days. Flies exist as nymphs subsurface prior to hatch date.

Fly HatchSizeDate
Quill Gordon12 - 14Apr 1 - Apr 15
Blue Winged Olive20 - 24Apr 1 - May 15; Sept 15 - Oct
Blue Quill16 - 18Apr 1 - May 15
Brown Stonefly14Apr 1 - May 15
Hendrickson10 - 12Apr 15 - May 15
Red Quill10 - 14Apr 15 - May 15
Green Caddis18 - 22May 1 - June 15
March Brown10 - 12May 1 - June 30
Alder Fly12May 1 - June 30
Tan Caddis16 - 20May 10 - June 30
Green Drake10May 15 - May 31
Grey Fox12 - 14May 15 - June 15
Brown Drake8May 15 - June 15
Sulphur14 - 16May 15 - July 15
Light Cahill12 - 16May 15 - July 31
Trico20 - 24July 1 - Aug 31
Golden Drake10 - 12July 15 - Aug 15
Slate Drake12 - 14July 15 - Sep 30
Terrestrials (various)8 - 16July 15 - Oct 15
White Fly12 - 14Aug 1 - Aug 31
Blue Dun22 - 26Aug 15 - Oct 31

Major Fly Hatches on the Farmington River

As with most trout streams, one of the most important aquatic insect and fly hatches on the Farmington River is the Blue-winged Olive. Blue-winged Olive hatches occur during early spring and then again in the fall.

Hendrickson and Red Quill mayflies are two more important hatches that begin in April and run through mid May. Having a few good nymph and adult fly imitations will serve you well when fishing the Farmington River in the spring.

For fishing sections of the Farmington with a fair amount of current, having a few March Brown and Light Cahill imitations is recommended. Amerian March Brown and Light Cahill hatches occur during late spring and summer where the water picks up speed—but these hatches tend to be sparse at best.

Caddisflies are one of the major food sources for trout throughout the summer months on the Farmington River, the cinnamon caddis being the most important caddis hatch of the season. Cinnamon caddis hatch from May through September. Tan and Green caddis, as well as Green sedges, are three more caddis hatches to consider. These later hatches occur during May and June.

Sulphurs during June, Little Black Caddis (Grammons) during April, and Tricos during July and August round out the noteworthy hatches on Farmington River.

Between June and October, terrestrials are on the scene. They make up a portion of trouts’ diet and should make up a portion of an angler’s fly selection. Beetles, ants, and grasshoppers are the patterns you want to have.

Midge hatches occur all season long and are probably the most important fly imitation to keep in your fly pouch. They always produce. A recommended fly size range for midge imitations is 18 to 24.

And.. if you’re interested in hooking some large browns, keep a few streamers on hand. We recommend sculpin patterns.