Central Pennsylania Hatch Chart

Few areas in the trout fly fishing world offer the extent of insect activity that can equal Central Pennsylvania’s limestone streams. The following listing is a general description of the insects and hatch times which you can anticipate experiencing on our streams.
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Winter

November to March

FLY PATTERN & SIZEPENNS CREEKBIG FISHING CREEKELK CREEKPINE CREEKSPRING CREEK
Tiny B.W.O. #20-24SporadicCommonSporadicCommonCommon
Little Black Stone #18Feb. & MarchFeb. & MarchSporadicSporadicFeb. & March
White Midge #22-28SporadicAll WinterSporadicAll WinterAll Winter
Grey Midge 22-26SporadicAll WinterSporadicAll WinterAll Winter
Blue Quill 18Nov. If 45 or betterAnytime its 45 or betterAnytime its 45 or betterNov. if 45 or betterSporadic

April

FLY PATTERN & SIZEPENNS CREEKBIG FISHING CREEKELK CREEKPINE CREEKSPRING CREEK
Little B.W.O. Dun #20SporadicAfternoon HatchLight Hatch, AfternoonFair only w/low waterAfternoon Hatch
Blue Quill #18Morning & Afternoon HatchMorning & Afternoon HatchMorning & Afternoon HatchMorning & Afternoon HatchMorning & Afternoon Hatch
Quill Gordon #14Lower Portion OnlyAfternoons
Light Hendrickson #14Lower Portion OnlyAfternoons
Little Black Caddis #16Mornings & AfternoonsMornings & AfternoonsBelow Elk Creek Junction Only
Grannom Caddis #12-14Mornings & AfternoonsMornings & AfternoonsBelow Elk Creek Junction Only
Little Blue Dun #20Mornings & AfternoonsMornings & AfternoonsBelow Elk Creek Junction OnlyMornings & Afternoons

May

FLY PATTERN & SIZEPENNS CREEKBIG FISHING CREEKELK CREEKPINE CREEKSPRING CREEK
Little Blue Dun #20Mornings & AfternoonsMornings & AfternoonsBelow Elk Creek Junction OnlyMornings & Afternoons
Blue Quill #18Mornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & Afternoons, Lower SectionMornings & Afternoons
Pale Yellow Cranefly #18Afternoons & EveningsAfternoons & EveningsAfternoons & Evenings, lightAfternoons & Evenings, Lower Sections
Chocolate Dun #16AfternoonsSporadicSporadicAfternoons Lower Section Only
March Brown #10-12From 10AM On, Randomly Sz. 10From 10AM On, Randomly Sz. 12From 10AM On, Random, But MildFrom 10AM On, Random, But Mild
Gray Fox #12-14From 11AM thru to EveningFrom 11AM thru to EveningFrom 11AM thru to Evening11AM thru to Evening, lower section11AM thru to Evening, lower sections best
Yellow Hendrickson (Ephemerella Invaria & Rotunda) #14Duns – 1PM to 6, Spinners followDuns – 1PM to 6, Spinners followDuns – 1PM to 6, Spinners followDuns – 1PM to 6, Spinners follow
Yellow Cranefly #16Afternoons & EveningsAfternoons & Evenings, lower section only
Sulphur Dun #164PM till dark. Starting Later as Hatch Continues4PM till dark. Starting Later as Hatch ContinuesEvenings From Mid-May thru JuneEvenings From Mid-May Into Early JulyEvenings From Mid-May thru June

June

FLY PATTERN & SIZEPENNS CREEKBIG FISHING CREEKELK CREEKPINE CREEKSPRING CREEK
Light Cahill #12-14EveningsEveningsEveningsEvenings, Below Main SpringsEvenings
Yellow Cahill #14EveningsEveningsEvenings, Below Main Springs
Green Drake # 8 – 10Evenings, Earliest Date – May 27th, Latest – June 14thEvenings, Generally after Penns’ HatchEveningsEvenings, Below Elk Creek JunctionEvenings, Lower Sections & Very Light
Green Caddis #14Afternoon & Evening, Upstream of Pine/Elk Only #14-16Afternoon & Evening #14-16Afternoon & Evening #14-16Afternoon & Evening, Lower Section #14-16Morning & Afternoon, #16-18
Blue Wing Olive #16Mornings, #16Mornings, #16Mornings, #16Mornings, #16Mornings, Upper Areas #14
Slate Drake #12-14Sporadic Thru The DaySporadic Thru The DaySporadic, Below Elk Creek Only
Sulphur Dun #16Near or At DarkNear or At DarkNear or At DarkNear or At DarkNear or At Dark
Tan Caddis #14Evenings, Often HeavyEvenings, Often HeavyEveningsEvenings, Below Elk Creek,
Tan Cranefly, #14-16Afternoon & EveningsAfternoon & EveningsAfternoon & EveningsAfternoon & EveningsAfternoon & Evenings
Great Stonefly #8Sporadic, Female Egglayers In EveningSporadic, Female Egglayers In EveningSporadic, Female Egglayers In EveningSporadic, Female Egglayers In Evening Below Elk Crk.

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July

FLY PATTERN & SIZEPENNS CREEKBIG FISHING CREEKELK CREEKPINE CREEKSPRING CREEK
P. Mollis, Little Mahogany Dun, #16Sporadic Hatch, Heavy Evening Spinner FallSporadic Hatch, Heavy Evening Spinner Fall
Yellow Drake #12Evenings, Lower Sections HeaviestEvenings
Sulphur Dun #16At Dark, Best Below Pine/Elk JunctionAt DarkAt DarkAt Dark, Downstream of Main SpringsAt Dark
Little B.W.O. Dun #20Afternoon & Late EveningAfternoon & Late EveningAfternoon & Late EveningAfternoon & Late Evening
Blue Quill #18Mornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & Afternoons
Little Blue Dun #20Mornings & AfternoonsMornings & AfternoonsBelow Elk Creek Junction Only
Tan Caddis #16Evenings, Often HeavyEvenings, Often HeavyEveningsEvenings, Below Elk Creek,
Amber Cranefly #16Afternoon & EveningsAfternoon & EveningsAfternoon & EveningsAfternoon & EveningsAfternoon & Evenings
Tricos #20-24Mornings, Best Downstream of Pine/Elk JunctionMornings, Below Main Springs down to PennsMornings

August

FLY PATTERN & SIZEPENNS CREEKBIG FISHING CREEKELK CREEKPINE CREEKSPRING CREEK
Little B.W.O. Dun #20Afternoon & Late EveningAfternoon & Late EveningAfternoon & Late EveningAfternoon & Late Evening
Blue Quill #18Mornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & Afternoons
Slate Drake, #12Sporadic Duns, Spinners at NightfallSporadic Duns, Spinners at NightfallSporadic Duns, Spinners at Nightfall
Tan Caddis #16Evenings, Often HeavyEvenings, Often HeavyEveningsEvenings, Below Elk Creek,
Tricos #20-24Mornings, Best Downstream of Pine/Elk JunctionMornings, Below Main Springs down to PennsMornings
Green Caddis #16Mornings, Downstream of Pine/Elk JunctionMorningsMorningsMorningsMornings

September

FLY PATTERN & SIZEPENNS CREEKBIG FISHING CREEKELK CREEKPINE CREEKSPRING CREEK
Tricos, #20-24Mornings, Best Downstream of Pine/Elk JunctionMornings, Below Main Springs down to PennsMornings
Slate Drake, #12Sporadic Duns, Spinners at NightfallSporadic Duns, Spinners at NightfallSporadic Duns, Spinners at Nightfall
Blue Quill #18Mornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & Afternoons
Little Blue Dun #20Afternoon & Late EveningAfternoon & Late EveningAfternoon & Late EveningAfternoon & Late Evening
Little B.W.O. #20-24Afternoon & Late EveningAfternoon & Late EveningAfternoon & Late EveningAfternoon & Late Evening
Brown Caddis, #14Afternoons, Upstream from Poe Paddy to Pine/Elk JunctionAfternoonAfternoon, Downstream from Main SpringsAfternoon
Tan Cranefly #16-18AfternoonAfternoonAfternoonAfternoonAfternoon

October

FLY PATTERN & SIZEPENNS CREEKBIG FISHING CREEKELK CREEKPINE CREEKSPRING CREEK
Slate Drake, #12Sporadic Duns, Spinners at Nightfall, Oct.Sporadic Duns, Spinners at Nightfall, Oct.Sporadic Duns, Spinners at Nightfall, Oct.
Blue Quill #18Mornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & AfternoonsMornings & Afternoons
Little Blue Dun #20Afternoon & Late EveningAfternoon & Late EveningAfternoon & Late EveningAfternoon & Late Evening
Little B.W.O. #20-24Afternoon & Late EveningAfternoon & Late EveningAfternoon & Late EveningAfternoon & Late Evening

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