Enjoying Outside! - Hummingbird Migration

Kristie Ehrhardt • October 2, 2025

I would be willing to bet that most of us have heard about and probably even know some of the details of  the Pacific Flyway. Just in case you need a refresher - the Pacific Flyway is one of four major bird migration routes through North America. It stretches 10,000 miles north-south from Alaska to Patagonia and provides essential stopover points for over one billion migrating waterfowl to rest and refuel. Every spring and fall birds follow some or all of this path pursuing food sources and heading to wintering or breeding grounds. There are several locations in our region where the birds either stop for a time or stay all winter including the Vic Fazio Yolo Wildlife Area in the Yolo Bypass, Sacramento National Wildlife Refuge Complex in the Northern Central Valley and Suisun Marsh hear the Sacramento/San Joaquin River Delta.


You may have also recently seen social media posts about hundreds of millions of birds migrating through the United States, primarily the Central Plains as migration reached its peak in that region just this past Thursday. It was estimated that 25 million birds were migrating through the Chicago area alone during a single night. During this event, biologists were urging people to turn off their non-essential outdoor lighting to help the birds navigate through the city during the overnight hours. Turning off lights and using special bird friendly film on windows helps to reduce fatal collisions with buildings and windows that are responsible for killing thousands of birds.


Spring and fall migration seems to be pretty well known for those of us here in the Sacramento Valley as our rice fields and wildlife refuges become alive with millions of migrating and wintering waterfowl. Often big grinds of geese can be heard, even during nighttime hours, as they fly overhead and spend their days feeding in flooded rice fields and other wetlands. It’s hard to miss thousands of noisy geese but, did you know that even the tiniest of birds migrate? Yep, even our little hummingbirds join in the migration activities! 


Like most migratory bird species, hummingbird migration occurs in the spring when the birds head north to breed and in the fall when the itty bitty birds head back down south to winter in warmer climates. Although those of us lucky enough to live here in the Sacramento Valley have resident species like the Anna’s hummingbird that we get to enjoy watching all year, other species such as the Rufous hummingbird, Calliope hummingbird, Black-chinned hummingbird, Broad-tailed hummingbird and others migrate through California on their way to or from Canada, Alaska, the Pacific Northwest, southern California, Mexico and Central America. It is believed that hummingbirds rely on instinct to know when to begin their northern or southern migration. Changes in daylight, temperature and food availability are also likely part of the trigger to begin the long journey. Beginning in late January/early February, some species begin to migrate north to breed in the southern and western United States from their wintering grounds in Central America or Mexico. Later in the spring as temperatures warm they may head further north. Some species such as the Rufous hummingbird migrate north through California in late winter and spring to breed in the Pacific Northwest and Alaska but returns south to its wintering grounds along the Rocky Mountains. The Calliope hummingbird is the smallest long-distance migratory species and travels through California in the spring and fall. The Black-chinned hummingbird is a medium to long distance traveler and navigates through California’s Central Valley to winter in southern California and Mexico. The Broad-tailed hummingbird breeds in the high sierra from late May to early August and then treks south to Mexico for the winter. Allen’s hummingbirds breed in coastal areas from California to Oregon and winter in southern California and Mexico. Interestingly, there are two subspecies, one of them is migratory and the other does not. Other species that are occasionally but not often observed moving through California include Ruby-throated hummingbird, Violet-crowned hummingbird, Broad-billed hummingbird and the Magnificent hummingbird.


These teensy, migrating birds often fly hundreds to thousands of miles, sometimes  over open water or other areas with no available food sources. In order to survive their voyage, hummingbirds must build up significant fat reserves prior to their departure as migrating is a huge energy expense for them. During flight their little hearts beat more than 1,200 times a minute and they complete 50 to 80 wingbeats a second! They can travel up to 23 miles a day, most of it just above treetops or over the water. They feed during the day when nectar sources are more accessible. Ways to help these little guys on their long expedition includes planting native species such as hummingbird sage, monkey flower and manzanita to provide natural sources of nectar as they pass through the area. You can also provide them with an alternate food source such as a hanging hummingbird feeder filled with sugar water. An easy and inexpensive recipe is ½ cup of white sugar dissolved in two cups of water. No boiling is necessary, simply stir and let it set at room temperature until the sugar is fully dissolved in the water - then it’s ready to use. If your feeder has red on it somewhere the little guys will find it, no need to add artificial color to their food. 


Fun facts :)

  • Did you know that hummingbirds play an important role in pollination? Some species of plants, especially those with long, tubular flowers can only be pollinated by hummingbirds.
  • Hummingbirds migrate alone rather than in large flocks like ducks and geese. Young hummingbirds must find their way on their own (a not so fun fact).
  • Usually the male birds leave and arrive first


Not so fun fact :(

  • Hummingbirds, like other pollinators, are declining due to habitat loss, pesticide use, and the spread of invasive plants outcompeting native nectar plants. 


To learn more about hummingbird migration and how you can help them check out our friends at the United States Forest Service’s publication
https://www.fs.usda.gov/wildflowers/pollinators/documents/HummingbirdBrochures/HummingbirdGuideCA.pdf


RECENT ARTICLES

By Ellen Jenkins July 2, 2026
From left to right, Horticulture Interns Ellen Jenkins, Rithika Warrier, and Diego Barraza Hernandez, with Education Associate Geoff Benn, who coordinates the internship program. From September to June, I worked as a Horticultural Intern at Tuleyome. Each week at the Woodland Regional Park Preserve, I would meet with my mentor Teri Barry. Over the course of the year, we worked together identifying, documenting, and analyzing the preserve's growth. Through this opportunity, I gained experience in hands-on restoration efforts, familiarity with plant taxonomy and classification, and community outreach.
By Kristie Ehrhardt July 2, 2026
I’m sure you already know that the Bald Eagle is used as a symbol of our Nation’s freedom, strength, perseverance and independence. It is said that our founding fathers chose the Bald Eagle to adorn our Great Seal because it is indigenous to North America and if you look closely at it, you’ll see that it is holding 13 arrows and an olive branch simultaneously symbolizing the power of war and the power of peace. But, what about our national mammal? Er, maybe you didn’t even realize that we had a national mammal… President Barack Obama designated the American Bison as our national mammal in May of 2016. It too is endemic to North America and in prehistoric times, millions of them roamed through roughly two-thirds of the United States. Their range was known as the “great bison belt” - a stretch of habitat that encompassed the forests of Alaska, the grasslands of the North American plains and stretched from the Great Basin east to the eastern Appalachian Mountains. Side note - I’m just gonna come clean right now and tell you that the historic range of the American bison, American Buffalo or just plain bison or buffalo does NOT include the Berryessa Snow Mountain National Monument (Monument). I’m supposed to be writing about the Monument region and I picked a topic that is clearly not there but it’s important and they are impressive so please don’t tattle. Another side note - the American Bison and the American Buffalo are one in the same and both names can be used interchangeably. Its scientific name (genus and species) is actually Bison bison so I guess calling them bison is probably more scientifically accurate but either works. Bison are North America’s largest land animal; an adult male averages about 2,000 pounds - that’s a ton (thanks Schoolhouse Rock, I will never forget this one!), are about 12 feet long from nose to rump and about six feet tall. Females max out at around 1,000 pounds and are a little over nine feet long. In the wild bison can live ten to twenty years. Both females and males have massive forequarters and sport what looks like a shaggy, long-sleeved sweater. Both sexes have short, curved horns that are an integral part of their status in the herd and defensive strategy. During the snowy winters, bison display a dark brown winter coat and in the summer they show off their lighter brown summer-bods. Calves typically arrive from March through May depending on weather conditions. When they’re first born calves are an orangey-red color which earned them the nickname “red dogs”. Within a few months they become darker brown like their parents and their little horns start to poke through. Around this time they also begin to develop their iconic shoulder hump. The hump is made of solid muscle buttressed by elongated vertebrae. This dense network of muscles act as a powerhouse that allows the animal to swing its massive head from side to side and plow through icy snow to access buried forage enabling them to survive even the harshest winters. Although they are not known for keen eyesight, bison have superb senses of hearing and smell. As monumental (get it?) as these animals are, they are shockingly quick and agile. Bison have been clocked at running 35 miles per hour (!), they can spin and turn on a dime, leap over high fences and are incredibly adept swimmers. All these mad skills on a strictly vegetarian diet - that’s ruminant efficiency. For thousands of years, before the European settlers arrived, Native Americans of all tribes and regions revered the bison. They were the cultural, spiritual and resource backbone of indigenous societies across the United States. Every part of the animal was used; the meat was consumed, the hide was used for clothing, shoes and shelters, and the bones and hooves were used for tools and weapons. Even the sinew was used for sewing and bow strings. Everything was copacetic then came the Europeans with their domestic cattle diseases and thoughtless greed. Bison were hunted to near extinction within roughly just 100 years. Their numbers went from an estimated 60 million (!) to less than 550 individual animals by 1889. They were hunted mercilessly and their habitat destroyed, some say as a way to control the Native Americans by removing their primary resource. One of the buffalo’s biggest fans was President Teddy Roosevelt. In the early 1880’s he traveled to what is now North Dakota (shout out to my people!) to hunt. After recognizing the bison’s diminishing population numbers he co-founded the American Bison Society in 1905 to help conserve and protect this American emblem. For many years the few buffalo that remained were only found in national parks and preserves but primarily on Native American reservations. Had it not been for the willingness of tribes across the country to work with interested individuals and state and federal governments, the American Bison would be gone today. Much like the Bald Eagle, the bison is an authentic symbol of American character and as it turns out, another one of the greatest conservation success stories in U.S. history. The bison within the Yellowstone National Park boundaries are direct descendants of the original animals that roamed our country’s grasslands and are the only herd that still occupy their original prehistoric location. This free-ranging herd numbers approximately 5,500 animals and is the largest herd on public land. Recovery efforts paid off and today bison can be found in all 50 states including private and tribal lands, national parks and wildlife refuges.