Rainbows spawn from late summer to early fall. Brown trout spawn from winter to early summer.

In Tennessee rainbows spawn in the spring. Brook and Browns spawn in the fall.

Most varieties of rainbow trout spawn in the spring, but they can spawn year round.

There are so many varieties, strains and hybrids of rainbow trout in the world, this is kind of an impossible question to answer. Here in Missouri, the state stocks two strains -- the Missouri Strain (oddly enough) and the Missouri Arlee Strain. One is a spring spawner, the other is a fall spawner. We also have some wild populations that often spawn in January & February. And finally, we have some private hatcheries that raise rainbows with a variety of bloodlines, like McCloud, Kamloops, Shasta, etc., and every mixtures seems to spawn a little differently, especially if they start inter-breeding with other strains. I'd contact your state conservation department and track down a fisheries biologist to talk to. They're the only ones who can give you a definitive answer for your local waters.

For the most part, rainbows spawn in the spring. many fish enter rivers in the late summer through the fall and winter over before spawning. IN NYS, the D.E.C. uses photo-period manipulation to encourage rainbows stocked into "steelhead" water to spawn in the fall. This helps keep their gene pool seperate.