Colorado Braces for Stressful Fish Season Amid Record Temperatures

Colorado Parks and Wildlife prepares for potential fishing closures due to low snowpack and high water temperatures.

Mar. 31, 2026 at 10:36pm

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As temperatures in Colorado's San Luis Valley continue to break historical records, Colorado Parks and Wildlife (CPW) is preparing for a challenging season for local aquatic life. With snow melting almost two months early, river and stream water levels have risen, but the increase won't last long. CPW is closely monitoring the Rio Grande and Conejos rivers and may implement voluntary fishing closures if water temperatures reach critical levels to minimize stress on fish populations.

Why it matters

The early snowmelt and high temperatures are putting significant stress on fish populations in the region. CPW is taking proactive measures to protect aquatic resources, but the situation highlights the broader impacts of climate change on Colorado's ecosystems and the need for adaptive management strategies.

The details

According to CPW Aquatic Biologist Estevan Vigil, the region is currently at 28% of median snowpack, which does not bode well for fishing. CPW has plans in place to monitor water temperatures on the Rio Grande and Conejos rivers, and they may implement voluntary fishing closures if the temperatures reach a certain threshold to minimize stress on fish. Several gauges are in place to help CPW make these determinations based on scientific data. CPW is also asking anglers to use common sense and avoid fishing smaller streams once the water temperature reaches 71 degrees, as the stress on fish populations can be devastating.

  • As temperatures around the San Luis Valley continue to break historical records.
  • Snow is melting almost two months early, raising river and stream water levels.
  • CPW will be monitoring the Rio Grande and Conejos rivers as summer approaches.

The players

Colorado Parks and Wildlife (CPW)

The state agency responsible for managing Colorado's wildlife and natural resources, including monitoring and protecting fish populations.

Estevan Vigil

A CPW Aquatic Biologist who is closely monitoring the situation and preparing for potential fishing closures.

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What they’re saying

“This is a big conversation we are having right now. Patterns looking forward are not looking good. We are at 28 percent of median snowpack and that does not bode well for fishing.”

— Estevan Vigil, CPW Aquatic Biologist

“Per state guidance and scientific data, we may be looking at fishing closures this year because of high water temperatures. Once a river reaches a certain temp, we have to do voluntary closures in order to minimize the stress on fish and aquatic resources.”

— Estevan Vigil, CPW Aquatic Biologist

“Fish can appear not to be stressed but can be under duress even in catch-and-release situations where the fish swims away. It is likely under these circumstances that the fish will swim away, only to later die.”

— Estevan Vigil, CPW Aquatic Biologist

What’s next

CPW will continue to monitor water temperatures on the Rio Grande and Conejos rivers and may implement voluntary fishing closures if the temperatures reach critical levels to protect fish populations. The agency is also asking anglers to be aware of any closures and to use common sense when fishing smaller streams.

The takeaway

The early snowmelt and high temperatures in Colorado's San Luis Valley are putting significant stress on local fish populations, highlighting the need for proactive management strategies to adapt to the impacts of climate change. CPW's efforts to closely monitor water conditions and potentially implement fishing closures demonstrate their commitment to protecting the region's aquatic resources.