When Do Caddisfly Hatch?

Maya Lin-Takahashi
Maya Lin-Takahashi
• • 7 min read

Grannom Caddis (Brachycentrus Spp. , See Image #6) Are Often the First Significant Caddis Hatches for Eastern Fly Fishers Fly Fishers Theodore Gordon...

When Do Caddisfly Hatch?

Grannom caddis (Brachycentrus spp., see image #6) are often the first significant caddis hatches for Eastern fly fishers

fly fishers
Theodore Gordon (September 18, 1854 – May 1, 1915) was an American writer who fished the Catskill region of New York State in the late 19th century through the early 20th century. Though he never published a book, Gordon is often called the "father of the American school of dry fly fishing".
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, often hatching in April just before or around the same time as Hendrickson mayflies.

What time of year do caddis flies hatch?

Except early in their emergence cycle, when morning hatches may occur particularly on the Firehole, caddis hatches are most likely either around midday or in the evening, with egglaying taking place in morning or afternoon.

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What time of day do mayflies hatch?

Mayflies. Mayflies during winter primarily consist of Blue Wing Olives aka Baetis (BWO). These mayflies hatch when the water temps get above 38 degrees and are best between 40 – 44 F. They will also hatch during the warmest parts of the day 10 – 3 pm and can hatch on sunny days, cloudy days, windy days and snowy days.

Maya Lin-Takahashi

Maya Lin-Takahashi

Consumer Tech & Gadget Reviewer
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Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.