I burned some older than those this season. I dug some bags out during the 'longest pellet' contest around Christmas. One bag of Pennywise I found was at least 3, maybe 4 years old. My stove didn't care one bit. 
I don't think wood goes stale or has a 'best if burned by XX' date. Keep them dry and you should be fine.
	
		
			
		
		
	
				
			I don't think wood goes stale or has a 'best if burned by XX' date. Keep them dry and you should be fine.
	
	
		
	

![[Hearth.com] Wood Pellets - Cold or Warm Up before use? [Hearth.com] Wood Pellets - Cold or Warm Up before use?](https://www.hearth.com/talk/data/attachments/94/94673-e594c12536015111db7524b9db2fce15.jpg?hash=70WOjimfaK)
