You can 'lager' after packaging as well. It's what I typically do. Tripel is obviously a big beer which takes a while to hit FG and a little while longer for the yeast to clean up after itself. A month in primary is a good guideline IME - the beer is completely done, pretty clear, and ready to package at that point. I say leave it in primary for a month, then package. If you're bottling, carb in the warmest room in the house until carbed and then you can cold condition until you like it. If kegging, try it every week until you're happy. Rough job.
Edit - Not trying to pass this off as the only way to do it. But I've brewed a lot of beer and this works. Just my $0.02 .
Want to say a big thanks to everyone who has pitched in!
My buddy and I are pretty new to homebrewing (so far have done 3 batches) and my wife loves Belgian Tripel's. So the help is greatly appreciated!
My hope initially was exactly what you recommended above.. Let the beer sit in Primary --> Package (we are going to bottle condition with DME) --> "Lager." I really appreciate the tip on Fermentation time (all prior brews were out of the Fermenter in 2 weeks). I do not want to overpitch this beer in the hopes that I get more of the Fruity Esters than the Spicy Phenols..
Does it really make a big difference what temp the final Lagering step takes place at? I was planning to Pitch ~1.5 packets of WLP530 with a 1.5L starter (24 hours prior to pitching) and in theory this yeast shouldn't be active at 45-50F. It seems to me the "Lagering" taking place in this recipe is simply to allow more "stuff" to fall to bottom of Bottle while the beer is conditioning.