S8, Ep 47: Central PA Fishing Forecast: George Costa's Summer Stream Insights
Episode Overview
George Costa, manager at TCO Fly Shop in State College, Pennsylvania, joins host Marvin Cash on The Articulate Fly fly fishing podcast for the latest Central PA Fishing Report as early summer conditions take hold across the region's limestone streams. Recorded in late June with the calendar almost at July, this report catches Central PA at an important seasonal juncture: stream temperatures have been favorable in the low 60s following a recent shot of rain, but a warming trend is on the horizon that will require anglers to exercise real discipline about when — and whether — to fish.
Costa reports stream temps around 61°F and highlights the key 68°F threshold: when water temperatures climb above that mark, catch and release fishing becomes inadvisable because trout cannot be safely released. He encourages anglers to shift their day structure around this reality, targeting early mornings and late evenings while avoiding midday sessions as temperatures creep upward next week.
On the insect front, Cahills and Isonychia (Isos) are active, and terrestrials are working well — Greenie Weenies, ants and Chubby Chernobyls are getting fish to look up. Dry fly action is most consistent in the evenings, with early morning fishing also productive. Trico hatches are still two to three weeks out, expected to arrive in mid-July. Costa also previews upcoming TCO Fly Shop events, including a summer fly fishing festival in August at the Boiling Springs location and a topwater smallmouth bass class with local guide Caleb available this weekend in State College.
Key Takeaways
- How to use the 68°F stream temperature threshold to protect fish during early summer heat and plan your fishing day accordingly.
- Why early morning and late evening are the most productive windows for Central PA trout fishing as summer temperatures build.
- When to expect trico hatches on Central PA waters — mid-July is typical.
- How terrestrial patterns like Greenie Weenies, ants and Chubby Chernobyls can keep fish looking up when midday hatch activity slows.
- Why recent rain is good news for Central PA anglers and how to think about conditions in the days following precipitation.
Techniques & Gear Covered
The episode focuses on early summer dry fly and terrestrial fishing strategies for Central PA limestone streams. Costa discusses the concurrent Cahill and Iso hatches driving evening dry fly action, alongside the broadening terrestrial game that is now well underway — Greenie Weenies, ant patterns and Chubby Chernobyls are all drawing fish to the surface throughout the day. Timing discipline is the defining early summer tactic: fishing early and late while avoiding midday sessions as air and water temperatures climb. Stream temperature monitoring functions as the underlying framework for all of this, with Costa referencing the 68°F threshold as the practical guideline that should govern whether catch and release fishing is appropriate on a given afternoon. Looking ahead, trico hatches on Central PA waters typically arrive in mid-July, bringing a different presentation challenge that favors fine tippets and small dries in the morning hours.
Locations & Species
The episode covers Central Pennsylvania's limestone stream network centered around State College and the surrounding Centre County watershed. Wild trout are the primary target species throughout, with the Cahill, Iso and terrestrial hatch discussions pointing squarely to the regulated limestone streams the region is known for. Costa also references TCO's Boiling Springs location as the site of the upcoming summer festival, touching on the Yellow Breeches corridor in Cumberland County. Smallmouth bass get a secondary mention in the context of a topwater class happening this weekend, reflecting the early summer period when bass become a compelling alternative as trout fishing demands closer attention to water temperatures.
FAQ / Key Questions Answered
How do rising stream temperatures affect catch and release fishing in Central PA during summer?
When stream temperatures exceed 68°F, Costa advises anglers to stop practicing catch and release fishing because trout cannot be safely released at that temperature. The physiological stress of a fight in warm water can be fatal even when fish appear to swim off, so monitoring stream temperature with a thermometer and avoiding midday sessions is the most responsible approach as summer heat builds.
What hatches are active on Central PA limestone streams in late June?
Cahills and Isonychia (Isos) are both active on Central PA streams in late June, with evening sessions producing the most consistent dry fly action. Terrestrials — including Greenie Weenies, ants and Chubby Chernobyls — are also working well and getting fish to look up throughout the day. Trico hatches are still about two to three weeks away, with mid-July being the typical window for them to pop.
When is the best time of day to fly fish Central PA trout streams in early summer?
Early morning and late evening are the most productive windows during the early summer period in Central PA. Midday fishing has been slow, with hatch activity and fish receptiveness to dry flies concentrated in the cooler parts of the day. This shift in daily timing becomes increasingly important as summer temperatures climb toward the 68°F temperature cut-off.
Why are terrestrial patterns effective on Central PA streams in late June?
By late June, streamside vegetation is fully established and insects like ants and beetles are regularly falling into the water. Costa specifically calls out Greenie Weenies, ant patterns and Chubby Chernobyls as current producers — foam and terrestrial imitations that draw opportunistic rises from fish that are actively looking toward the surface during the early summer terrestrial season.
When should Central PA anglers expect the trico hatch to begin?
Based on Costa's experience and current conditions, trico hatches on Central PA waters typically start in mid-July, roughly two to three weeks from the time of this report. He had not yet heard of any trico activity at the time of recording and expects it will be at least a few more weeks before the hatch appears in appreciable numbers.
Related Content
S8, Ep 42 - Exploring Terrestrials and Summer Patterns: George Costa's Fishing Forecast
S8, Ep 35 - From Sulphurs to Drakes: George Costa's Essential Fishing Report for Central PA
S7, Ep 70 - The Dog Days of Summer: Trico Tactics in Central PA with George Costa
S7, Ep 57 - Cicada Mania: Central PA Fishing Insights with George Costa
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In this Central PA Fishing Report on The Articulate Fly, host Marvin Cash checks in with George Costa of TCO Fly Shop in State College for an early summer conditions update covering central Pennsylvania trout streams. With stream temps hovering around 61°F and a warming trend forecast for the following week, Costa advises anglers to monitor water temperature closely and avoid catch-and-release fishing once readings climb above 68°F. Cahill and Iso hatches are active alongside a growing terrestrial bite — green weenies, ants and Chubby Chernobyls are drawing fish to the surface — with the best dry fly action concentrated in the early morning and late evening hours as midday activity slows. Costa puts the trico hatch roughly two to three weeks out and previews TCO's upcoming fly fishing festival at the Boiling Springs location in August and a weekend topwater smallmouth class.
EPISODE SUMMARY
Guest: George Costa - Shop Manager at TCO Fly Shop (State College, Pennsylvania)
In this episode: TCO Fly Shop's George Costa delivers an early summer Central Pennsylvania Fishing Report as stream temperatures approach the critical threshold for catch-and-release safety. Topics include current Cahill and Iso hatch activity, the emerging terrestrial season, stream temperature management and a timeline for the approaching trico hatch.
Key fishing techniques covered:
- Dry fly fishing during evening Cahill and Iso hatches
- Terrestrial pattern presentations with green weenies, ants and Chubby Chernobyls
- Early morning and late evening timing strategies to maximize dry fly opportunities
- Stream temperature monitoring for responsible catch-and-release practice
- Identifying the mid-July trico hatch window and preparing for the transition
Location focus: Central Pennsylvania limestone streams (State College area)
Target species: Trout
Equipment discussed: Green weenies, ant patterns, Chubby Chernobyls, Cahill patterns, Iso patterns
Key questions answered:
- When does the trico hatch typically begin in Central PA?
- What stream temperature triggers a pause on catch-and-release trout fishing?
- What dry fly patterns are working on central Pennsylvania streams in early summer?
Best for: All anglers planning to fish central Pennsylvania trout waters in early to mid summer
FULL TRANSCRIPT:
Marvin Cash
Hey, folks, it's Marvin Cash, the host of The Articulate Fly.We're back with another Central PA Fishing Report with the man himself, Internet George Costa. George, how are you?
George Costa
I'm amazing as always. Marvin, how are you?
Marvin Cash
I'm doing well and trying to stay out of trouble. And how's the Internet treating you?
George Costa
The Internet is amazing. Such an amazing thing. It's. What a wonderful time to live.
Marvin Cash
I know you particularly love the interconnected nature of the Internet more than anything. Do you like it better than BlackBerry brandy?
George Costa
No, it's not too hot for that. I told you, it's rum season. It's rum season. BlackBerry brandy does not start till after Thanksgiving. Marvin, everyone knows that I'm with you.
Marvin Cash
Well, let's just compare it. Is the Internet better than dark rum?
George Costa
No.
Marvin Cash
Okay, well, getting to the serious stuff, you know, it looks like you've been kind of cool, but it looks like that's getting ready to kind of change in your world. What are you seeing and what do you expect in the next week or two on the water in central PA?
George Costa
All right, so past week has been pretty good. Temps have been nice and cool. At night, we've had, you know, highs in the low 80s, so stream temps were great yesterday.I was out there around noon, temp to stream at around 61, which is wonderful for this time of year. And we got a good shot of rain last night. We got a little more coming this weekend, so that's really good.Temps are going to start creeping up again next week. Looks like it's going to get warm. So it is definitely the time of year to temp the stream over 68.Please refrain from practicing catch and release fishing because you are not going to release the fish in good shape. As far as bugs and everything goes, it's been pretty consistent. We've seen cahills, there's some Isos around.Terrestrials are really starting to work well, those greeny weenies, those ants, chubby Chernobyls, things like that are getting fish to look up. Hatches are definitely best in the evenings.If you want to get some consistent dry fly action, get out there late in the day, definitely that shift to early morning fishing is good. Late in the evening fishing is good. Midday's definitely been a little slow.Um, so this little bit of rain this week and the cooler temps are going to carry us into next week, but we'll see how much the water drops. Um, I think we should be good other than to, you know, just maybe lay off a bit in the afternoon. It's been pretty consistent.You know, early summer fishing here, it's just about July, so if you can get out and fish, do it. Stay early, stay late.
Marvin Cash
There you go. When do you expect to see tricos in any appreciable number now?
George Costa
Probably not for a few more weeks. That usually is more of a mid July early. I would, I would say two to three weeks until we start seeing some tricos.I haven't heard of any yet and it's going to probably be a few more weeks till that pops.
Marvin Cash
Gotcha. Well, you know, I know you. I think you've got one fishing event in the books.You've probably got some upcoming and probably got some cool stuff at the shop you want to share with folks too, right?
George Costa
Yeah, for sure. We've got our fly fishing festival coming up in August down at the Boiling Springs location. That should be a lot of fun.It is every year a couple classes in some of our shops. We've got a smallmouth class coming up this weekend, so if anybody out in the world hears produce this before Sunday.One of our local guys here, Caleb, is doing a good top water small mouth class and we got a couple seats open for that. And I'm sure the other shops have some good stuff going on.So check our website as far as all the events and I know we've got a couple sales coming up, so just, you know, check our website tco fly fishing.com to stay up to date on everything we're offering here.
Marvin Cash
Yeah, well there you go. Well folks, you know we love questions and George really loves questions. Particularly after the advent of the Internet. Right George?
George Costa
Exactly. Before the Internet all the questions were boring. Now they're AI generated and so thoughtful.
Marvin Cash
Yes, well please send us your non AI generated thoughtful questions. You can email me or DM me on Instagram, whatever's easiest for you.And if we use your question, we will get entered in a drawing for something cool from the shop and I will send you some articulate fly and butcher shop swag.And before I let you get back to early summer retail bliss, George, with no dark rum, you want to let folks know shop hours and all that kind of good stuff.
George Costa
Absolutely. Here at State College we're open 9 to 6 Monday through Saturday, 9 to 3 on Sunday. Sunday. All the other shops are open similar hours.So we'll see you out on the water.
Marvin Cash
Well, there you go. Well listen folks, as I always say, you owe it to yourself to get out there and catch a few tight lines everybody. Tight lines. George.
George Costa
Take it easy, Marv.
Manager | Guide | TCO Fly Shop State College
For over five years, George has joined us every two weeks to give us the latest conditions update for Central Pennsylvania trout streams, answer listener questions and share upcoming events at TCO Fly Shop.
Formed in 1990, TCO Fly Shop is the largest, most complete Fly Fishing Outfitter in the US. TCO (Tulpehocken Creek Outfitters) was named after one of the finest tailwater fisheries in the East, the Tulpehocken Creek.
With 5 retail locations and a significant eCommerce business, TCO Fly Shop offers the widest selection of the best products available in the Fly Fishing industry. TCO is committed to providing superior customer service. Our goal is to provide each client the same excellent experience whether that experience is online, in any of our shops, on the stream with our guides, or at any of our educational events. We continue to grow based on a winning mix of quality products, service excellence and passion for education.
