It has been a tough year in just about every State this year,warm un-seasonable weather is not helping with getting the Coyotes out moving to look for food and most are moving at night.
I have read what others are trying and at this time of the Year the Coyotes are mating so any Female Invitaion Howl may work,Barking and Pup Distress sounds seem to be the ticket...I was out this evening and had several Coyotes barking and howling but none came in and it got dark on me so I packed it up and walked home.
Stay after the Coyotes and enjoy being outdoors,that usually helps me get thru a Hunt that no Coyotes show up on....its also that time of year when the Bucks are loosing their Antlers so Shed Hunting while walking in to call Coyotes makes it worth the trouble!