I realize "its the web" is a thing but back when I was doing freelance writing for tech magazines I found the Writers Market[1] very handy. For print publications it had print calendars and editorial descriptions of what they liked to publish. I've not bought one since the rise of web journalism but I expect there are resources out there which have this info.

[1] http://www.amazon.com/Writers-Market-2016-Trusted-Published/...