During the winter horned larks can be found in large numbers in the Northwest, but mostly on the eastern side of the Cascades. There are a few resident populations on the western side where I live but I had never seen a horned lark until this January when I found a male foraging near Schwartz Lake at Ridgefield.
I use Northwest Birds in Winter by Alan Contreras when I want to get more specific info on the distribution of one of our birds during the winter than you can get out of a general purpose field guide. I bought my copy in 1997, about a year after I moved here, when I met Alan at an Audubon event and he signed my copy. It’s definitely not a field guide and not useful for identifying birds, but a nice complement to my army of guides when I want to dig a little deeper.