assuming the north side access is closed by then, you will be limited to the south side.
The ridges are safe since they offer little danger of major avalanches. Sergeants Ridge is easier and a bit longer, Casaval Ridge is more direct and slightly more difficult (pinnacles to traverse, steeper headwall) but quite reasonable for an experienced mountaineer.
These would be much more enjoyable with a coating of snow to consolidate the choss.
The weather is fairly predictable in that area. Follow your forecasts, and no matter what expect high winds (60+mph). I've done a one-day ascent in March in perfect conditions and it still takes a while, so also plan on staying overnight unless you're in excellent shape. Skis could be a way to bail off quick but the ridges don't offer easy skiing.