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Colorado Black-notched Bumble Bee
Insects diurnal

Colorado Black-notched Bumble Bee

Bombus bifarius

A hardy resident of the High Rockies, the Colorado Black-notched Bumble Bee is easily identified by its striking red belt and industrious spirit. These essential pollinators are the heartbeat of mountain meadows, bringing life to the highest elevations of the American West.

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Quick Identification

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Size

Workers: 8–14 mm (0.3–0.55 in); Queens: 15–19 mm (0.6–0.75 in); Wingspan: 25–35 mm (1.0–1.4 in)

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Colors

Thorax is yellow with a distinctive black 'V' or notch; abdomen features prominent red or orange bands on segments 2 and 3.

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Key Features

  • Vibrant red or orange bands on the second and third abdominal segments
  • Black notch or 'V' shape cutting into the yellow thorax between the wings
  • Dense, fuzzy hair covering the entire body
  • Relatively short face and tongue compared to other bumble bees

When You’ll See Them

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Activity pattern diurnal
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Peak hours 9:00 AM – 4:00 PM
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Season June – August
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Diet A generalist nectar and pollen feeder that prioritizes native mountain plants like penstemons, lupines, asters, and rabbitbrush.
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Habitat Montane meadows, subalpine forests, and high-elevation suburban gardens, primarily in Colorado and Utah.

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Behavior

The Colorado Black-notched Bumble Bee is a high-altitude specialist, engineered by evolution to thrive in the thin, cool air of the Rocky Mountains. As a eusocial insect, it lives in colonies where a single queen leads a workforce of her daughters. They are famously industrious foragers, often the first bees seen in the morning and the last to leave the flowers before the high-country sun sets. They employ a technique called 'buzz pollination,' where they vibrate their flight muscles at a specific frequency to dislodge pollen that other insects cannot reach.

In a backyard setting, these bees are incredibly docile and focused on their mission. They rarely pay attention to humans or pets unless their nest—usually hidden underground in an abandoned rodent burrow—is stepped on. Because their active season in the mountains is short, their behavior is characterized by a sense of urgency, moving rapidly between blooms with a loud, purposeful hum that is easily picked up by camera microphones.

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Camera Tips

To capture high-quality footage of the Colorado Black-notched Bumble Bee, your camera placement is everything. These bees have predictable 'circuits' they fly daily. Position your camera within 12 to 18 inches of high-value nectar plants like Lavender, Bee Balm, or Purple Coneflower. Use a macro lens if your camera supports it, and aim for a 45-degree downward angle to ensure the black 'notch' on the thorax and the red abdominal bands are both visible in the frame.

Lighting is your best friend when filming insects. Place your camera so the sun is behind it, illuminating the bee's fuzzy texture and vibrant colors. Since these bees move quickly, set your AI camera to its highest possible frame rate. This allows you to review the footage in slow motion, which is often the only way to clearly see the wing beats and the specific hair patterns used for species identification. If your camera has a 'pre-roll' or 'buffer' feature, enable it so you don't miss the moment the bee lands.

You can create a 'filming station' by placing a flat landing stone in a sunny patch of your garden near flowering plants. Dabbing a tiny amount of organic honey or a concentrated sugar-water solution onto a specific flower can encourage the bee to linger for a few extra seconds, providing the perfect window for a clear shot. However, the best 'lure' is simply a diverse patch of native wildflowers. During the peak of summer, keep an eye on the weather; these bees often become hyper-active just before a mountain rainstorm, providing excellent opportunities for high-energy action shots.

Similar Species

Species that look similar or are commonly confused with Colorado Black-notched Bumble Bee.

Hunt's Bumble Bee

Hunt's Bumble Bee also has red bands but lacks the black 'notch' on the thorax, showing a more solid yellow area instead.

Vancouver Bumble Bee

This sister species is nearly identical but is typically found further west and north, often lacking the vibrant red bands seen in the Colorado variety.

Frequently Asked Questions

They are most active during the warmest parts of the day, typically from mid-morning to late afternoon (9 AM to 4 PM), as they require solar warmth to keep their flight muscles active in high-altitude environments.
The best way to attract them is to plant native Rocky Mountain flowers like Mountain Bluebells, Rocky Mountain Penstemon, and Rabbitbrush. Providing a chemical-free environment and leaving some patches of bare ground for nesting will also help.
They eat nectar for energy (carbohydrates) and collect pollen to feed their larvae (protein). They are generalists but show a strong preference for native perennial wildflowers.
Yes, they are very common in suburban gardens throughout the Colorado Front Range and Utah's Wasatch Range, especially in neighborhoods that prioritize native landscaping.
Look for the specific combination of bright red/orange bands on the middle of the abdomen and a yellow thorax with a black 'V' or notch of hair between the wings.

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