The Match-the-Hatch Cheat Sheet: Fly Sizes, Tippet & When to Fish Them
Every fly box tells the same story in seven chapters. Midges to streamers, tiny to meaty — once you see the pattern, you'll never stare at a hatch wondering where to start again. This is the grid we keep laminated in the truck: what each fly imitates, the hook size to reach for, the tippet that won't spook or snap, and the conditions where each one earns its keep.
Smaller number = bigger fly. The bar shows each category's hook-size range on the full spectrum.
Fluoro = fluorocarbon (sinks, near-invisible) · Copolymer = nylon copolymer (floats higher)
How to use this on the water
Work the grid backwards from what you see. Bugs in the air or rings on the surface? Match the insect column first, then drop to the size range. Water up and dirty? Jump straight to streamers and stop fighting it. When two categories overlap — say a #16 could be a BWO or a caddis — fish the one whose conditions match your day, and let the trout settle the argument.
Tippet, translated
The X system is backwards on purpose: higher X means thinner, weaker, stealthier. 6X–7X is gossamer — for tiny flies and glassy water where trout inspect everything. 4X–5X is the daily driver. 0X–3X is rope, built for stripping streamers through logjams. Copolymer floats higher for dry flies; fluorocarbon sinks and disappears for nymphs and streamers. Match the tippet to the fly, not the fish — the fish rarely cares, but the drift always does.
Print it, screenshot it, or just remember the shape of it: small and slow at the top, big and ugly at the bottom, and everything in between is a mayfly. Not sure which chapter is playing this month? Check the trout hatch calendar — then go match a hatch.
Keep the momentum going:
Put it to work on the water