How long to cellar IPAs and APAs?

You will get varying opinions here typically in the range of 0 - 6 weeks preferred conditioning time. Oxidation fade will depend mostly on how good your process is at eliminating oxygen ingress post fermentation to begin with. CO2 flushing your receiving keg and transfer lines, coupled with doing a "sealed transfer" from primary fermenter to keg will help immensely in that regard.

 

3 weeks work just fine for me. In total I ferment 1 week and let it condition for other 3 weeks and APAs taste awesome.

 

On a related note, should you be refrigerating your APA/IPAs as soon as they are carbonated, or do they condition better at cellar temperature?

 

I used to find my homebrew pale ales to peak about 3-4 weeks old and DIPA around 4-6 weeks. The grassy notes do you notice are on beers you dry hop?

 

Gordon Strong goes into pretty good detail of the conditioning process wherein colder usually ages slower.

 

If you force carbonate (keg), it's probably refrigerated BEFORE it's carbonated...but, yes if bottling keeping it cold should slow down the degradation of an IPA or APA.