Yellowstone National Park, located primarily in Wyoming but also extending into Montana and Idaho, is a geothermally active region that draws millions of visitors each year. While the park is famed for its geysers, wildlife, and dramatic landscapes, one of its most mesmerizing natural features is its hot springs. These thermal pools offer an extraordinary glimpse into the dynamic processes occurring beneath the Earth’s surface, where underground heat, water, and minerals converge to create vibrant, steaming waters in every imaginable hue.
Hot springs in Yellowstone are more than just visual spectacles. They are ecological microhabitats that host unique microorganisms, called thermophiles, which thrive in high-temperature, acidic conditions. The minerals dissolved in these waters produce brilliant colors ranging from deep blues to rich reds and yellows, making each hot spring a living canvas of geology and biology.
Exploring Yellowstone’s hot springs is an unforgettable experience. The park contains over 10,000 thermal features, and while many are small and secluded, several are world-famous for their size, color, and accessibility. Let’s explore the most popular hot springs in Yellowstone, highlighting their characteristics, geology, accessibility, and visitor experience.
Table of Contents
Quick Reference Table: Named Hot Springs in Yellowstone National Park
| Hot Spring Basin / Area | Notable Hot Springs |
|---|---|
| Upper Geyser Basin (Old Faithful Area) | Morning Glory Pool, Doublet Pool, Heart Spring, Chromatic Pool, Blue Star Spring, Crested Pool, Ear Spring, Sponge Spring, Belgian Pool |
| Midway Geyser Basin | Grand Prismatic Spring, Excelsior Crater, Turquoise Pool, Opal Pool |
| Lower Geyser Basin | Silex Spring, Clepsydra Pool, Pink Cone Pool, Firehole Hot Springs, Great Fountain Pool system, Imperial Geyser Pool |
| Norris Geyser Basin | Emerald Spring, Green Dragon Spring, Crackling Lake, Porkchop Geyser Pool |
| West Thumb Geyser Basin (Yellowstone Lake Shoreline) | Abyss Pool, Black Pool, Fishing Cone Hot Spring, Thumb Paint Pots, Lakeshore Geyser Pools |
| Mammoth Hot Springs Terraces | Minerva Terrace, Canary Spring, Palette Spring, Cleopatra Terrace, Jupiter Terrace, White Elephant Back Terrace, Orange Spring Mound |
| Other Notable Hot Springs Around the Park | Sapphire Pool, Rainbow Pool, Ojo Caliente Spring, Punch Bowl Spring, Beryl Spring, Boiling River Hot Springs, Lone Star Geyser’s hot spring pool |
Grand Prismatic Spring
Grand Prismatic Spring is arguably the most famous hot spring in Yellowstone National Park. Located in the Midway Geyser Basin, this spring spans approximately 370 feet in diameter and is over 120 feet deep, making it the largest hot spring in the United States and the third-largest in the world.
The spring is renowned for its vibrant concentric rings of color. The deep blue center is caused by the high purity and temperature of the water, which absorbs red wavelengths of sunlight. Surrounding this are bands of green, yellow, orange, and red, created by thermophilic bacteria that thrive in the cooler peripheral waters.
Visitors can access Grand Prismatic Spring via a boardwalk trail that allows close-up views of the vibrant pools. For a panoramic perspective, the recently constructed Fairy Falls Trail overlook provides a stunning aerial view of the spring and its surrounding terraces, showcasing the full spectrum of colors and the steam rising from the hot water.
Morning Glory Pool
Located near the Upper Geyser Basin, Morning Glory Pool is a medium-sized hot spring famous for its deep, vivid colors resembling the morning glory flower. The center of the pool is an intense azure blue, while the edges display bright yellows, oranges, and greens due to thermophilic bacterial growth.
The hot spring measures about 23 feet in diameter and reaches temperatures around 188°F (87°C). Its unique colors are delicate and can change over time, influenced by the water’s chemistry and the introduction of foreign objects, such as coins or debris, which have historically disrupted the bacterial mats.
Morning Glory Pool is easily accessible via a short boardwalk trail, making it a favorite stop for visitors touring the Upper Geyser Basin. The pool’s iconic appearance has made it one of Yellowstone’s most photographed thermal features.
Black Pool
Black Pool, also located in the Upper Geyser Basin, is a hot spring known for its deep, inky blue color. Unlike other springs with vibrant bacterial mats along the edges, Black Pool maintains a near-pure, uniform color due to its extreme heat, averaging around 172°F (78°C).
The high temperature prevents most thermophiles from thriving, creating a deep, clear pool that appears almost black when viewed from above. Black Pool is roughly 55 feet in diameter and is surrounded by a gently sloping terrace that is accessible via boardwalks. Its clarity and depth create an otherworldly effect, especially on calm mornings when the surface reflects the surrounding forest.
Excelsior Geyser Crater
Excelsior Geyser Crater, while technically a geyser, is often regarded as one of the park’s largest hot springs because of its massive pool and continuous water flow. Located in the Midway Geyser Basin, the spring spans approximately 130 feet in diameter and discharges about 4,000 gallons of water per minute into the Firehole River.
The water maintains a near-boiling temperature of 199°F (93°C), preventing significant bacterial growth and giving the pool a clear blue color. Excelsior’s size and heat make it one of Yellowstone’s most dramatic thermal features, though it rarely erupts due to underground vent pressures being relieved through constant overflow.
Visitors can observe the spring from a boardwalk trail along the Midway Geyser Basin, which also provides views of the adjacent Grand Prismatic Spring. The combination of size, color, and proximity to other major thermal features makes Excelsior Geyser Crater a highlight for park visitors.
Turquoise Pool
Turquoise Pool, located in the Upper Geyser Basin, is a smaller hot spring distinguished by its bright blue waters. Its vivid turquoise hue is caused by the pool’s high mineral content and the absence of bacterial mats due to temperatures averaging around 175°F (79°C).
The pool is about 25 feet in diameter and often exhibits gentle steaming along its edges. Visitors enjoy the serene appearance of Turquoise Pool, which contrasts with the more active and bubbling geysers nearby. Its accessibility from the Upper Geyser Basin trails makes it an easy addition to a walking tour of the area.
Rainbow Pool
Rainbow Pool, situated in the Lower Geyser Basin, is famous for its striking array of colors, including shades of orange, green, and blue. The colors are produced by heat-loving microbes that form mats around the edges of the pool, gradually changing in hue with the seasons and water temperature fluctuations.
The pool is about 30 feet in diameter and maintains a temperature of approximately 185°F (85°C). Rainbow Pool is easily accessible via boardwalk trails and offers visitors an opportunity to observe the intricate interplay between geothermal activity and microbial life. Photographers often favor this spring for its vivid natural palette.
Jewel Geyser Hot Spring
Jewel Geyser Hot Spring, located in the Upper Geyser Basin, is a small, bubbling hot spring with intense colors that resemble gemstones, hence the name. Its water maintains temperatures around 182°F (83°C), preventing many large bacteria from inhabiting the center, but allowing colorful microbial mats to flourish along the edges.
The spring’s small size makes it intimate for visitors, who can observe the delicate steam rising from the bubbling water. It is accessible from the boardwalk trail that connects the Upper Geyser Basin features, making it convenient for visitors exploring the famous Old Faithful area.
Sapphire Pool
Sapphire Pool is renowned for its deep, sapphire-blue center and vibrant green periphery. Located in the Biscuit Basin, the pool measures roughly 20 feet across and reaches temperatures near 170°F (77°C).
The pool’s color is attributed to both its clarity and the growth of heat-tolerant bacteria along the edges. Sapphire Pool is accessible via a short loop trail in Biscuit Basin, allowing visitors to take close-up views and photographs. Its calm waters often provide mirror-like reflections, enhancing the scenic quality of the area.
Opal Pool
Opal Pool, situated in the Upper Geyser Basin, features milky turquoise water surrounded by creamy yellow and white mineral deposits. Its temperature averages around 175°F (79°C), which supports colorful microbial mats along the shallow edges.
The pool is small but highly photogenic, offering a dramatic contrast to the surrounding geysers and thermal features. It is easily viewed from boardwalks and is often visited in conjunction with Morning Glory Pool and other Upper Geyser Basin attractions.
Emerald Pool
Emerald Pool is a medium-sized hot spring located in the Lower Geyser Basin. Its water displays a deep green color in the center and golden-brown microbial mats along the edges, forming a striking contrast. The spring maintains a temperature around 180°F (82°C).
The pool is accessible via boardwalk trails and is a favorite stop for visitors interested in photographing thermal features. Its calm surface and intense coloration make it a particularly scenic feature in the Lower Geyser Basin area.
Abyss Pool
Abyss Pool, found in the West Thumb Geyser Basin along the shores of Yellowstone Lake, is a deep and striking hot spring. The pool reaches temperatures of nearly 200°F (93°C), creating a clear, almost translucent deep-blue water appearance.
Its depth, exceeding 50 feet in some areas, and intense color make Abyss Pool a remarkable sight. The pool is accessible via a short boardwalk trail, and its location along the lake shore adds to the dramatic visual appeal as steam rises and mingles with the cool air above Yellowstone Lake.
Firehole Lake Hot Springs
Located along Firehole Canyon Drive, the Firehole Lake Hot Springs consist of several pools and small springs that exhibit a combination of vivid blue water and multi-colored bacterial mats. Temperatures vary between 175–190°F (79–88°C), allowing a diverse range of thermophiles to flourish.
Visitors can walk along boardwalks that run beside the pools, observing the constant activity of steaming water, bubbling mud, and vibrant microbial mats. Firehole Lake Hot Springs are often paired with stops at Firehole Falls and Kepler Cascades during scenic drives.
Chromatic Spring
Chromatic Spring, located near the Norris Geyser Basin, is a smaller pool celebrated for its dramatic color patterns. The spring’s mineral-rich water supports thermophilic bacteria that create bands of yellow, green, orange, and red around the edges.
The water temperature averages 185°F (85°C), which is hot enough to prevent the pool from cooling and allows for intense colors to develop. Chromatic Spring is visible from a short trail and is an excellent example of how minerals and microbes interact to produce a natural palette reminiscent of a rainbow.
Bluebell Pool
Bluebell Pool is a hidden gem in the Lower Geyser Basin, featuring deep blue waters surrounded by subtle green and yellow microbial mats. Its relatively high temperature, around 180°F (82°C), keeps the center free of large bacteria, highlighting the clear blue color of the water.
The pool is accessible via short, well-maintained trails and offers a peaceful alternative to the more crowded thermal areas. Photographers and nature enthusiasts often seek Bluebell Pool for its tranquil beauty and vivid colors.
Turquoise Geyser Hot Spring
Located in the Biscuit Basin, Turquoise Geyser Hot Spring is notable for its gentle bubbling and rich turquoise color. The pool maintains temperatures around 178°F (81°C), which supports a small fringe of heat-loving bacteria along the edges.
The pool is easily accessible from the boardwalk, providing close-up views of the rhythmic bubbling and colorful water. Turquoise Geyser Hot Spring is often visited alongside Sapphire Pool and other nearby thermal features, offering a diverse and visually stunning experience.