Your winter tires should be installed when the daily high temperature is 7C or lower.  Today’s “WINTER” tires are meant to improve traction in colder weather, regardless of whether there is ice and snow on the ground.  All season radials begin to lose their grip below 7C, even on dry pavement!  If you don’t drive great distances, it will not hurt to install your winter tires a little early.  I think any time in October is a perfect time to install.  Sure their may be some warmer days ahead.  But you will be prepared for that freak winter storm or icy morning AND you’ll beat the rush.