If you’re watching the mountains this winter and wondering what the upcoming rafting season on the Arkansas River will look like, you’re not alone. Every year, we hear the same question from future rafters: “Is there enough snow for good river flows?”
Here’s the good news — in Colorado, winter isn’t really over until it’s over.
While January and February get a lot of attention, March and April are typically the snowiest months in Colorado’s high country, including the headwaters that feed the Upper Arkansas River Valley. That means there is still a very real chance that we’ll reach average or above-average Colorado snowpack by May, even in years that start slow.
For anyone planning a trip with Monumental Expeditions, this matters — because snowpack directly shapes spring and summer rafting conditions on the Arkansas River, including popular sections like Browns Canyon, Salida Valley, and The Numbers.
How Colorado Snowpack Works (and Why Late-Season Snow Matters)
To understand why March and April are so important, it helps to know a little about how snow behaves in Colorado’s mountains.
What is Snow Water Equivalent (SWE)?
Hydrologists track something called Snow Water Equivalent (SWE) — basically how much water is stored in the snowpack if it were melted all at once. This is one of the best indicators of how much runoff will eventually flow into rivers like the Arkansas.
In the mountains above Salida, Buena Vista, and Chalk Creek, snowpack builds layer by layer all winter, with each storm adding to the total.
Here’s why late-season snowfall is especially powerful for Arkansas River rafting conditions:
1) Higher Elevation = Better Snow Storage
Most of the Arkansas River watershed sits between roughly 9,000 and 12,000 feet. In March and April, storms at these elevations almost always fall as snow — not rain — which helps protect and build the snowpack instead of melting it early.
2) Longer Days, But Still Cold Nights
By March and April, Colorado gets more sunshine, but nighttime temperatures in the high country remain cold. This allows snow to accumulate while slowly “ripening” (becoming denser), which leads to a steadier, more predictable melt later in the season.
3) Better Timing for Spring Runoff on the Arkansas River
Snow that falls in March and April tends to melt more gradually in May and June. Instead of all rushing off at once, it feeds creeks, groundwater, and tributaries that eventually join the Arkansas River — creating longer-lasting, healthier flows for rafting.
4) Big Storms Can Quickly Change the Picture
Early winter snowpack numbers can look low, but a few strong storm cycles in March and April can significantly boost Colorado snowpack in a matter of weeks. We’ve seen many seasons in the Upper Arkansas River Valley where late storms completely turned things around.
What This Means for Browns Canyon Rafting & Arkansas River Trips
For Monumental Expeditions, this is why we don’t stress over early-season snow reports. What matters most is what happens in the mountains right now and over the next couple of months.
If March and April deliver typical snowfall — which they often do — there’s a strong chance we’ll head into May with average or better snowpack in the Arkansas River Basin, setting up an excellent rafting season.
That typically means:
- Strong, fun flows for Browns Canyon rafting
- Great water levels for family-friendly Class II–III trips
- Beautiful snow-capped peaks along the river
- That classic Colorado spring runoff feel on the water
Watching Colorado Snowpack and Arkansas River Flows
We keep a close eye on SNOTEL snowpack stations, weather patterns, and river gauges throughout the winter and spring. Living and working in a mountain watershed means paying attention to how storms, snowpack, and runoff all connect.
But history — and a little snow science — gives us plenty of reason to stay optimistic.
So if you’re planning a rafting trip on the Arkansas River, don’t let mid-winter snow reports worry you. In Colorado, the season isn’t decided until March and April have had their say.
And when the snow melts and the river rises, we’ll be right here at Chalk Creek Campground in Nathrop, ready to take you rafting with Monumental Expeditions.
See you this spring and summer on the Arkansas River.