There are a lot of early season styles other than match-the-hatch. When water is low and clear match the hatch may be needed to fool them. But early season opens other doors.
The big gaudy wet fly approach: One early season approach is to use big colorful winged wets in the 6 to 8 range. The ones Brodheadscreek posted will do fine, but you don't have to go that fancy. You do need to get down though and may need a split shot or a sinking head. Think like a steelheader - a group that lives for big trout in cold water.
Fan the water with bucktails: Tie on a bucktail and start covering water. Toss a streamer under downed trees, along foam lines and seams, across the head or tail of a pool. Bucktails are the old school choice, but wooly buggers, Shenks white minnows, and a whole host of other streamers in the 6 to 8 range will do. This approach allows you to cover a lot of water and see how your favorite streams are doing this year. Even flashes from fish chasing your streamer can help you plan later outings.
Junk flies: Cold water trout (especially stockies, but the wild ones too) can fall for junk flies like worms (Infamous Pink Worm, Chamios worm), Green Weenies, Red Hots ( a green weenie in red), sucker spawn, CJ Nymphs (gold bead, pink marabou tail, peacock herl body, partridge or hen soft hackle collar), Pink Squirrel, and a host of others. You can experiment, but different local favorites have a way of catching more fish. Most of junk flies are easy to tie and fun to use. Even though you're using wild flies, it pays to change up now and again because even stupid fish get wise to a pattern after a while.
Adams, regular or parachute 18 - 12: Most early mayflies are gray - hence the old moniker the "April Grays". You can carry BWOs, Hendricksons (male and female), Blue Quills, mahogany Quills, Quill Gordons, etc or have an 18, 16, 14, and 12 Adams and be right 90% of the time.
In the spirit of full disclosure, I'm an old fart who thinks hatch the hatch all the time is boring and not as fun as mixing it up.