Spring Fishing In New Mexico

Spring has sprung here in Northwest New Mexico, and it’s one of the goofiest times of year on the San Juan. The water is dirty and the fish seem to change their mind about what they want to eat and where they will be every other day.

While some dislike the the “spring roulette”, others embrace the chess game. Do not fear the dirty water or the seemingly stubborn trout, spring can be one of the best times of the year to fish the good ole San Juan.

Here are some things that keep me sane during the guide day, I hope they help you put trout in the bag until the water clears and the sight fishing returns.

1) Trout Move

It sounds simple but trout moving is often overlooked by anglers. Trout are motivated to move by things like water temperature and the availability of food at the given time as well as spawn (which is tied to water temp.) In the spring temperature and hatches vary throughout the day and throughout the spring months. Overnight cold snaps could have fish dropping back into slower deeper sections of rivers and creeks. The eruption of a Baetis or midge hatch can have trout moving up into shallower areas to feed. With hatches, trout also will move vertically though the water column as well. Thinking about where trout are in the river sectionally and then where the could be in the column is key. This can be a challenge on rivers with off colored water. Seeing your favorite river at low clear flows will pay its dividend when the water gets high or stained.

2) Bugs

A lot of shoulder season trout fishing is done with attractor style patterns. The classic induced take vs trout actively feeding scenario. Generally, the shoulder seasons on the San Juan River don’t have as much bug activity was when the river warms via ambient air temp. This is not always the case and may not be the case on your local water. Remember that there are always mayfly nymphs, midge larva, scuds, ect. moving around the lower third of the water column on the San Juan. While the trash rigs still produce in the Spring, an influx of active midges and mayflies definitely catch the trouts attention. A trash rig is a guide slang for things like eggs, leeches, worms and generally loud patterns that aren’t imitative.

Trout will begin to suspend and many anglers that are fishing heavy trash rigs in the lower third of water column will be fishing under the trout happily eating in the middle and upper third. Many times the difference between a great day and a tough one is a couple sizes of split shot.

My favorite small mayfly pattern for the San Juan!

3) Mix It Up

Mixing it up means trying different things, fishing different areas or fishing a combination of trash and imitative patterns. Maybe the trout moved to deeper water because of cold snap, your trash rig stopped working? Try bugs. Before changing flies, either lighten up your weight or go heavier. Generally I like to start low and work my way up the water column, but it all depends on the day and the conditions presented.

Remember to have fun. Think about trout movement via location in the river and water column. If somethings not working don’t be afraid to mix it up with the rig or try fishing a new water type.

I hope this quick blog post helps you put a couple more trout in the bag on the San Juan this Spring.

See you out there

– James

spring fishing new mexico
April 6, 2025
James Garrettson

Our Trips

Experience the iconic San Juan River and Colorado's High Country.

Our Rivers

Learn more about the rivers we call home and why they're such rad fisheries.

Our Guides

We've got the fishiest and most professional team of guides on the Juan.

James Garrettson

James Garrettson

James Garrettson was quickly consumed by fly fishing after receiving a copy of the Curtis Creek Manifesto at age 10. At 14 years old James was the youngest employee at Orvis. About Trout is focused on creating positive experiences for all anglers. James wholeheartedly represents this philosophy.

More From The Mesa

How to Fish Changing Flows on a Tailwater

Unfortunately, drought continues to impact the Southwest this year. Here on the San Juan River, one major advantage we have is that we’re fishing a cold-water tailwater. Even during hot summer conditions, cold water is still being released from Navajo Dam, allowing us to maintain a high level of fishing throughout an otherwise difficult drought…
Read More

Three Dry Flies for August on the San Juan River

August is traditionally one of our favorite months to fish dry flies on the San Juan River. It’s also one of the least windy times of the year, which can make for some great evenings spent headhunting rising trout. With the strong summer sun, the best dry-fly windows are usually early in the morning, on…
Read More

San Juan River Fishing Report — August 7, 2026

As of this writing, August 7th, the Bureau of Reclamation has increased flows on the San Juan River below Navajo Dam to 850 CFS. This is still a very good wade flow, and we’re extremely fortunate to have cold water on the San Juan right now while many rivers across the West are dealing with warmer,…
Read More