I have successfully gotten Standard BF seats to OGG over Memorial Day in January.

More importantly, when CO releases seats is far from predictable. For instance, for travel EWR-PEK, standard BF seats MAY be available ABOUT 330 days out. Yet, for R seats (upgradable with miles), CO tends to batch release these, with 3-4 months being released at a time , anywhere from about 210 to 300 days out. This means you can get a free ticket, but can't buy one and upgrade, which makes no sense. But this is CO! So there may be no R seats avaialble for periods beyond 7 months out, and all of a sudden there are tons of R seats available over a 3-4 month travel timeframe.This means that if your outbound is in one timeframe and you want your return in a later time frame, you are out of luck for several months until the next batch release, by which time, all of the seats from the previous batch are long gone.
SInce I am more interested in R seats transpacific, I tend to montor KVS and see some amazing things that happen with these seats.
I can't directly relate this to standard coach award seats, but it is possible that there is some batch releasing also being done.

OT,speaking of R seats, Friday AM, I booked PHL-IAH-SMF-IAH-PHL for October at $309 RT all in. I checked KVS and there were at least 3-7 R seats on each segment. I called back in the afternoon to use miles (I have tons) to upgrade,and by then virtually all of the R seats were gone (I did book OW outbound, where I got the last PHL-IAH R seat (There were 5 in the AM). Checking KVS I found that the number of R seats had indeed decreased wildly. (THe farewas now 390 as well). I guess it shows you can't put off until the afternoon what you can do in the AM. A lot of problems would be solved if CO would allow display of award seat codes (E,EG,etc).