NQL In the previous post, I was referring to the air pump.
In your case You can add bacteria any time now. At you latitude you pond has not stratified yet and you no doubt still have oxygen at the pond bottom. However you should first measure your water temerature. Many brands of bacteria do not work best in water less than 60F unless specifiec otherwise on the label.
Also at your latitude I would not think you would need to run your compressor 24/7. How big is your trout pond again?
