Early season, September>early October is tough with burn areas & fireweed. Burns of 2-4 years are ok but 3-7 years the FW gets tall & bushy.
Later mid-October and late seasons are best. Couple good storms, wind to weather down the FW.
I've hunted burn areas of weathered down fireweed where the deer tracks were many and fresh. Can be lots of new feed in the burns.
But if no tracks or other deer sign (scat), the deer aren't there....yet.