Similar situation, just a bigger tractor. I run mine for at least 10 minutes, before I put it to work. I like to see the temp gauge register some warmth. I then make a run down to the mailbox, (1000 ft) and back before putting the beast to work. That gives the transmission and hydraulics a chance to get warmed up.
The hydraulics were a little slow this AM, with the temp at 5 above. I spent an hour pushing the snow drifts back with the FEL.