DVC at WDW currently has two main demand seasons: about mid-Jan to near end of Sep, which is DVC's lower demand season during which you can usually get rooms at 7 months out at near park resorts and not just SSR, OKW and AKV except for certain "usual suspects" for which room demand is usually high for a limited number of rooms: BWV standard and boardwalk view, BLT standard view, AKV club level and value rooms, VGF studios, and during some holiday times BCV and BLT theme park view. In fact, the time during that about nine month period with the highest demand and biggest risk of not getting a near park resort is the weekend in the latter part of Feb when they have the Princess half marathon. Spring break weeks including the Easter weeks are actually among the easier times to get a near park resort at 7 months out.
The higher DVC demand season at WDW is currently end of Sep through marathon weekend in Jan during which it can be difficult and at times impossible to get a near park resort and even AKV and OKW may sometimes have a risk of being difficult first and second week of Dec, Christmas week, Columbus Day weekend and the weekend after it, few days around Thanksgiving and Veterans Day weekend. Thus far, SSR has always been open at 7 months out except that grand villas and treehouses are sometimes gone during very high demand times. Note that 1BRs are usually the last to reserve and even during that high demand season, you may find them at 7 months out at near park resorts when nothing else is open.