Timing on bulk pellets purchases has less to do with the calendar, and more to do with how much pellets you have left in your bulk bin or silo. You will want to buy pellets at least 3 tons at a time, or you may end up paying a surcharge. You should monitor your fuel storage levels, or if you’re fortunate, you have a fuel storage solution that has built-in technology that notifies you when you need to order.
You should talk to your fuel supplier to find out how much lead time they need. They may want to provide pellets to others on the same truck run, so if you give them a week or two week window, that might help them out. If you’re not in the immediate vicinity of a pellet supplier or distributor, try to size your pellet storage to minimize the number of deliveries.
Pellet fuel deliveries often require that the burner is off during the delivery. Some systems have a switch on the outside wall that the delivery driver can use to shut off the burner. Others will require you to be home if there is no access to the inside of the home, and the connectors are on the outside wall.