I recently released a 2026 United States holiday calendar featuring nature photographs taken throughout 2025 along Colorado’s Front Range.
This calendar combines practical use with seasonal landscapes, showcasing how the scenery around Boulder and the Rocky Mountains changes month by month. From frost-covered winter mornings to alpine autumn trails, each image represents a moment in the natural rhythm of the year.
Below is a closer look at the photographs included in the calendar.
Download the high-resolution 2026 U.S. & Japan Holiday Calendar (PDF) here — Adobe PDF, 1.2 MB.
(Revision 1 — updated January 28, 2026 with updated text and photo replacement)
January
Frost-Covered Trees on a Clear Winter Morning in Colorado Park
(January 2025)
📷 View this photo on Adobe Stock
After several days of cold, cloudy weather, the sky finally cleared one morning. I looked outside and saw trees and grasses covered in frost. I headed to a nearby arboretum to capture the scene.
Although it’s a color image, the landscape feels almost like black and white, reflecting the quiet stillness of winter.
February
Plateau Meadows and Flatirons Mountains After New Snow, Boulder, Colorado
(February 2025)
📷 View this photo on Adobe Stock
Winter along Colorado’s Front Range is often dry, with many snowless days. After a fresh snowfall following a long dry spell, I visited the Davidson Mesa Trail to photograph the prairie and the Flatirons under snow.
The early morning light gave the landscape soft, cool tones.
March
Magnolia Flowers in Full Bloom in Spring, Colorado
(March 2025)
📷 View this photo on Adobe Stock
Trees begin blooming in Boulder County as early as March. Magnolia blossoms are especially vulnerable to frost, and sudden cold snaps often damage them before peak bloom.
In 2025, temperatures stayed mild long enough for the flowers to reach a rare, beautiful full bloom.
April
American Plum Blossoms and Spring Meadow, Boulder, Colorado
(April 2025)
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American plum is a native shrub whose blossoms can resemble cherry blossoms when blooming densely. They also tend to last longer than many spring flowers.
This image was taken near Coot Lake in Boulder, with the Flatirons visible in the distance.
May
Ditch in a Water-Filled Spring Grassland, Boulder, Colorado
(May 2025)
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As spring flowers fade, the Boulder prairie turns a vivid green. Snowmelt from the mountains fills small ditches and waterways across the grasslands.
This photo was taken near Teller Farm North, where water disappears again by late fall and winter.
June
Wildflower Meadow on the Boulder Prairie in Early Summer, Colorado
(June 2025)
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By June, expansive wildflower meadows appear across the prairie and foothills.
This scene was photographed along the South Boulder Creek West Trail, with the Flatirons rising in the distance.
July
Bald Eagle Looking Out from a Leafless Tree, Rock Creek Trail, Colorado
(July 2025)
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Bald eagles can be seen year-round in Boulder County, sometimes even flying over town.
This eagle was perched for a long time on a bare branch near Stearns Lake in Broomfield, calmly surveying its surroundings.
August
Mountain Reflections on Tranquil Mitchell Lake in Summer, Indian Peaks Wilderness, Colorado
(August 2025)
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Summer is the most beautiful season for high alpine lakes. On calm mornings, the water becomes mirror-like, reflecting the mountains of the Indian Peaks Wilderness.
September
Autumn Alpine Trail with Red and Yellow Foliage, Pawnee Pass near Lake Isabelle, Indian Peaks Wilderness, Colorado
(September 2025)
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At higher elevations, fall arrives early. Alpine plants turn red and yellow, softening the rugged, rocky mountain landscape.
This trail near Pawnee Pass captures the brief but spectacular high-altitude autumn season.
October
Yellow Quaking Aspen and Red Smooth Sumac Foliage in Autumn, Rattlesnake Gulch Trail, Eldorado Springs, Colorado
(October 2025)
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Autumn in Boulder County often features bright yellow aspen leaves alongside the deep red of smooth sumac. Combined with evergreen forests, the landscape can resemble a natural traffic light of green, yellow, and red.
This photo was taken along the Rattlesnake Gulch Trail in Eldorado Canyon State Park.
November
Clear Late Autumn View of McIntosh Lake and Longs Peak in Longmont, Colorado
(November 2025)
📷 View this photo on Adobe Stock
From the eastern side of Boulder County, there are fewer mountains blocking the view of Longs Peak.
This image was taken along the McIntosh Lake Loop in Longmont, where late-autumn trees frame the lake with Longs Peak rising in the distance.
December
Rolling Trail Leading Toward the Indian Peaks Wilderness Mountains in Late December, Colorado
(December 2025)
📷 View this photo on Adobe Stock
December 2025 was unusually dry in the lowlands, leaving the prairie mostly snow-free, while the high mountains remained snow-covered.
From the East Boulder Trail, both the younger sandstone foothills and the much older Precambrian peaks of the Indian Peaks Wilderness can be seen together — a striking geological contrast.
Download the PDF Calendar
The full printable calendar (PDF) is available at USAJPN.com, a site documenting life, education, systems, and photography from a U.S.–Japan perspective (Link).
A4 Paper
Hammermill A4 Paper
(Amazon: USA)
→ Explore more trails: Boulder Trail Index
This page is part of a growing local trail archive maintained by the YRAIN Project.
