Delaware River Hatch Chart
"You've never "matched the hatch" until you've fished the Delaware!"

Guide Service & Outfitters

As with any hatch chart, this is only a guide to when you can expect certain flies to hatch. The weather, water levels and just the overall type of season will affect the actual periods of bug activity. Some of the hatches occur throughout the river system, while others are more prolific in specific sections. Just another reason why a full time professional fly fishing guide can make your visit to the river more enjoyable and productive.

If you look through the chart you will notice some overlap among the various hatches. This often translates to having multiple insect species hatching at the same time. On top of this, add fish that are keyed into one specific specie and then into one specific life stage of that insect. It gets interesting.

Delaware River Hatch Chart

Insect	Artificial	Size	Dates *
Taeniopteryx fasciata	Brown Stone	12/14	3/25-5/5

Baetis vagans	Blue Winged Olive	18/20	3/25- 5/15

Chimarra	Little Black Caddis	18/20	4/1 - 5/20

Paraleptophlebia adoptiva	Blue Quill, Mahogany Dun	18/20	4/10 - 5/10

Epeorus pleuralis	Quill Gordon	12/14	4/10 - 5/15

Ephemerella subvaria	Hendrickson	12/14	4/15 - 5/25

Ephemerella invaria	Sulfur	12/14	4/20 - 6/10

Brachycentrus	Shad Fly, Grannom Caddis	16	4/25 - 5/25

Ephemerella rotunda	Sulfur/Pale Evening Dun	12/14	5/1 - 6/10

Stenonema vicarium	March Brown	10/12	5/15 - 6/5

Stenonema fuscum	Gray Fox	12/14	5/25 -6/20

Ephemerella dorothea	Sulfur	16/18	5/25 - 7/15

Ephemera guttulata	Green Drake	8/10	6/1 - 6/15

Epeorus vitreus	Sulfur	12/14	6/1 - 8/10

Isonychia bicolor	Dun Variant, Slate Drake	10/12	6/1 - 10/31

Stenonema Ithaca & canadense	Light Cahill	12/14	6/5- 9/10

Ephemerella cornuta	Blue Winged Olive	14	6/5 - 6/25

Ephemerella atenuata	Blue Winged Olive	18/20	6/15 - 7/15

Ephemera simulans	Brown Drake	8/10	6/5- 6/15

Potamanthus	Cream Variant	10	6/15 - 8/25

Tricorythodes	Trico	24	6/28 - 10/15

Pseudocloeon	Blue Winged Olive	24	6/28 - 11/20

Ephemerella lata	Blue Winged Olive	22	7/15 - 11/24

Paraleptophlebia debilus	Blue Quill	16/18	7/1 - 10/15

Ephoron leukon	White Fly	12/14	8/20 - 9/15

*The first date listed is usually the earliest you can expect particular hatch, the last date is generally the latest date.

Delaware River Hatch Chart

Insect

Artificial

Size

Dates *