Minnesota supports four of North America’s five loon species, all of which have been documented in the state in recent years, though with very different levels of regularity. The Common Loon is the only widespread and regularly occurring species, breeding across the northern lake regions and serving as the state’s characteristic loon. In contrast, Red-throated and Pacific Loons appear as migrants, while the Yellow-billed Loon is an exceptional visitor recorded only sporadically. This guide highlights the loons of Minnesota with a focus on identification, seasonal patterns, and where each species is most likely to be encountered.
Common Loon
Gavia immer
- Identification: Large, heavy-bodied loon with a long, straight bill, black-and-white breeding plumage, and plain gray-and-white non-breeding plumage.
- Where found: Breeds widely across the northern two-thirds of Minnesota on clear lakes and also uses large inland lakes in the state as migratory staging sites.
- How to spot: Look for a low-riding waterbird that dives smoothly for fish, flies with a long straight neck and feet trailing beyond the tail, and gives far-carrying wails and tremolos on breeding lakes.
- Conservation status: Least Concern (IUCN); common and well studied in Minnesota, where the breeding population is stable and may be slightly increasing.
The Common Loon is Minnesota’s state bird and most iconic waterbird, long associated with the lake country of the north. It measures 66 to 91 centimeters (26 to 35.8 inches) in length and has a long, heavy body, a straight dagger-like bill, and strong low-set legs that make it powerful in the water but awkward on land. Adults in breeding plumage show a black head and neck with white vertical striping, a sharply checkered black-and-white back, and clean white underparts. In non-breeding plumage, the upperparts are plain gray and the underparts white.
On the water, Common Loons sit low with the body deeply submerged and the head held erect. They dive smoothly and precisely in pursuit of fish and may remain underwater for extended periods before resurfacing, sometimes with prey held in the bill. In flight, they appear long and level-bodied, with a shallow steady wingbeat, the neck stretched straight ahead, and the feet extending beyond the tail. Their wailing and tremolo calls carry widely across breeding lakes and are one of the species’ most distinctive field marks in Minnesota. Fish form the core of the diet, and the species also takes other aquatic prey. Water clarity is especially important because this loon depends on sight to capture prey underwater.
In Minnesota, the Common Loon is a regular breeding resident and migrant. The species now breeds across the northern two-thirds of the state, largely north of the Minnesota River, with the greatest densities in the north-central and northeastern regions. The highest habitat suitability lies in the Laurentian Mixed Forest Province and the northern part of the Eastern Broadleaf Forest Province, though scattered suitable sites also occur in south-central and southwestern Minnesota and along the Mississippi River valley. The species uses a wide range of breeding lakes in the state, from large clear lakes to smaller lakes, sometimes including lakes only 4 to 20 hectares in size, and it may defend territories that include multiple lakes. Spring migration in Minnesota peaks from mid-April through early May, and fall migration peaks in mid-October. Large inland lakes such as Mille Lacs and Winnibigoshish can hold major staging concentrations, sometimes with hundreds or thousands of birds. An increasing number of migrants linger into early to mid-December, and a few overwintering records exist.
The Common Loon is common in Minnesota and one of the state’s most thoroughly studied breeding birds. Multiple monitoring efforts have found that the statewide breeding population has remained stable for several decades, and some data suggest a slight increase tied in part to southward recolonization in parts of the state, including the Twin Cities region. The species had a broader historical breeding range in Minnesota and later retreated northward, but recent records indicate some renewed expansion near the southern edge of its current breeding distribution. Important threats and pressures in Minnesota include shoreline development, recreational disturbance on breeding lakes, disease events affecting migrants, and contaminants such as mercury and lead. Water clarity is also closely tied to loon abundance and productivity in the state. Despite these pressures, the overall conclusion from Minnesota studies is that the species has maintained a stable and healthy population.
Red-throated Loon
Gavia stellata
- Identification: Small, slender loon with a thin, slightly upturned bill, gray head, and a reddish throat patch in breeding plumage; plain gray above and white below in non-breeding plumage.
- Where found: Rare migrant in Minnesota, occurring primarily along the Lake Superior shoreline, especially near Duluth and adjacent coastal areas.
- How to spot: Look for a slim loon on open water with an upturned bill and buoyant flight, most often during spring migration along Lake Superior.
- Conservation status: Least Concern (IUCN); rare and localized in Minnesota, where it occurs mainly as a migrant.
The Red-throated Loon is the smallest and most delicate loon recorded in Minnesota and appears only as a rare migrant in the state. It measures 53 to 69 centimeters (20.9 to 27.2 inches) in length and has a slender neck, a narrow bill often held at a slight upward angle, and a light, streamlined body. In breeding plumage, adults show a smooth gray head and neck with a distinct reddish throat patch and dark upperparts finely marked with pale streaks. In non-breeding plumage, which is more typical of birds seen in Minnesota, the upperparts are plain gray-brown and the underparts white, with a sharply defined white face and throat.
In the field, Red-throated Loons are most often detected on open water, where they sit relatively high compared to larger loons and move with a lighter, more buoyant profile. They dive to capture small fish and can be agile in flight, appearing slim-bodied with a slightly upturned bill and steady wingbeats. Vocalizations are rarely noted in Minnesota due to the species’ transient presence, but individuals may be identified by structure and flight style when moving along the Lake Superior shoreline. Most records involve single birds or small groups, though larger aggregations can occur during peak migration.
In Minnesota, the species is a rare and localized migrant, strongly tied to the Lake Superior coastline in St. Louis County. Nearly all records come from the Duluth area, including Park Point, Duluth Harbor, and nearby shoreline sites such as Brighton Beach and the Superior Entry. Occurrence inland is extremely limited. Spring migration produces the highest numbers, with peak passage from April through May and occasional concentrations of dozens to hundreds of individuals on Lake Superior. Fall migration is less pronounced, typically involving small groups or scattered individuals moving south. Summer records are rare and usually involve isolated birds, while winter occurrence is exceptional. Most individuals recorded in Minnesota are likely non-breeding or immature birds passing through.
The Red-throated Loon remains rare in Minnesota and has no established breeding population in the state. Its occurrence is restricted to migration periods, and abundance varies widely from year to year depending on conditions on Lake Superior. Broader population trends indicate stability at the continental scale, though the species remains vulnerable to threats such as oil spills, entanglement in fishing gear, and habitat changes in Arctic breeding and coastal wintering areas. Within Minnesota, its limited and localized occurrence makes it primarily of interest to observers monitoring migration along the Lake Superior shoreline.
Pacific Loon
Gavia pacifica
- Identification: Medium-sized, slender loon with a straight bill, gray head, black throat with fine white striping in breeding plumage, and plain gray-brown above and white below in non-breeding plumage.
- Where found: Rare migrant in Minnesota, occurring mainly along the Lake Superior shoreline with occasional inland records on large lakes and reservoirs.
- How to spot: Look for a slim loon with a level bill on open water during migration, most often in non-breeding plumage and sometimes in small groups.
- Conservation status: Least Concern (IUCN); very rare in Minnesota, where it occurs only as an irregular migrant.
The Pacific Loon is a rare and irregular visitor to Minnesota and is encountered far less frequently than other loons in the state. It measures 58 to 74 centimeters (22.8 to 29.1 inches) in length and has a sleek body, rounded head, and straight bill typically held level. In breeding plumage, adults show a smooth gray head, a black throat bordered by fine white vertical lines, and a sharply patterned black-and-white back. Most individuals observed in Minnesota, however, are in non-breeding plumage, appearing gray-brown above and white below with a pale face and a subtle dark line across the throat.
In the field, Pacific Loons are usually identified by structure and proportions rather than plumage, especially when seen at a distance. They sit relatively low on the water but appear slimmer and more delicate than Common Loons, with a level bill that helps separate them from Red-throated Loons. They dive to pursue small fish and other aquatic prey and may be seen singly or in small groups during migration. Vocalizations are rarely noted in Minnesota due to the species’ brief and irregular occurrence.
In Minnesota, the Pacific Loon is a very rare migrant with a strongly localized distribution. Most records come from the Lake Superior shoreline in St. Louis County, including areas such as Duluth and nearby coastal points, where birds occur during migration. Occasional inland records exist from large lakes and reservoirs, including sites in eastern Minnesota such as Lake St. Croix, but these are infrequent. Spring records are scarce but occur mainly in May, while fall records are somewhat more regular, typically in November. Summer observations are exceptional and usually involve single individuals or small numbers. Most birds recorded in the state are non-breeding or immature individuals passing through.
The Pacific Loon has no breeding population in Minnesota and remains one of the least frequently observed loon species in the state. Its occurrence varies from year to year and is influenced by migration patterns and observer coverage along Lake Superior. At the continental scale, the species remains numerous and widely distributed, with no clear evidence of major declines, though it faces localized threats such as entanglement in fishing gear and disturbance associated with development in Arctic breeding areas. In Minnesota, its rarity and irregular appearance make it primarily of interest as an occasional migrant rather than a regularly encountered species.
Yellow-billed Loon
Gavia adamsii
- Identification: Very large loon with a thick neck, blocky head, and a heavy pale yellow or ivory bill; black-and-white in breeding plumage and gray-brown above, white below in non-breeding plumage.
- Where found: Extremely rare visitor in Minnesota, recorded mainly on Lake Superior and large inland lakes such as Mille Lacs and Lake Winnibigoshish.
- How to spot: Look for a massive loon with a large pale bill on open water, most often in late fall or early winter on large lakes.
- Conservation status: Near Threatened (IUCN); an exceptionally rare vagrant in Minnesota with only a small number of confirmed records.
The Yellow-billed Loon is the largest and rarest loon recorded in Minnesota and appears only as an exceptional visitor. It measures 77 to 92 centimeters (30.3 to 36.2 inches) in length and has a heavy body, thick neck, and a large, blocky head. The most distinctive feature is its substantial pale bill, which appears yellow or ivory and is noticeably larger and deeper than that of other loons. In breeding plumage, adults show a bold black-and-white checkered pattern with a dark head and neck, while in non-breeding plumage, which is typical of Minnesota records, the upperparts are gray-brown and the underparts white.
In the field, Yellow-billed Loons are usually identified by size and bill structure rather than plumage detail. They sit low in the water but appear bulkier and heavier-headed than Common Loons, with a thick bill that is often held slightly upward. Like other loons, they dive to capture fish and aquatic prey and may remain submerged for extended periods. Most individuals in Minnesota are observed singly, and vocalizations are rarely reported due to the species’ irregular occurrence and the non-breeding condition of most birds.
In Minnesota, the Yellow-billed Loon is an extremely rare but recurring vagrant with records spanning several decades. Most observations involve single individuals found on large bodies of open water, particularly along the Lake Superior shoreline in St. Louis County and on large inland lakes such as Mille Lacs Lake and Lake Winnibigoshish. Occurrence is strongly seasonal, with most records in late fall and early winter, especially in November and December, suggesting that birds reaching the state are displaced migrants. A few early winter and occasional spring records exist, but there is no regular pattern of occurrence.
The Yellow-billed Loon remains one of the rarest regularly documented vagrants in Minnesota, and its appearance is unpredictable from year to year. Identification can be challenging, and some reports have been rejected due to confusion with other loon species. At a broader scale, the species has a small global population and faces threats from habitat disturbance and industrial development in Arctic breeding areas, as well as entanglement in fishing gear. Within Minnesota, however, its significance lies primarily in its rarity and association with large open-water habitats during migration.
Where and When to See Loons in Minnesota
Loons in Minnesota are most closely tied to large freshwater lakes, and both location and season strongly shape the likelihood of encountering each species. The Common Loon is widespread and regularly observed across the northern two-thirds of the state during the breeding season, especially on clear lakes in the north-central and northeastern regions. It is most easily found from late spring through summer, when territorial pairs occupy lakes and their calls carry across the water. During migration, large lakes such as Mille Lacs and Winnibigoshish can host noticeable concentrations, particularly in mid-April through early May and again in mid-October.
Other loon species are far more localized and seasonal. Red-throated and Pacific Loons occur primarily as migrants along the Lake Superior shoreline, with the Duluth area and nearby coastal points providing the most reliable viewing locations. Red-throated Loon shows a pronounced spring peak, sometimes in large numbers, while Pacific Loon is rarer and more irregular, appearing mainly in small numbers during migration. Yellow-billed Loon is an exceptional visitor, most often recorded in late fall or early winter on Lake Superior or large inland lakes. Observers focusing on major water bodies, especially along the Lake Superior coast during migration, have the best chance of encountering Minnesota’s full range of loon species.
For a broader perspective, see our guide to the types of loons in North America, and explore the Birds of Minnesota and Birds of the United States pages for additional regional and national bird guides.
