No it's not too early to look. It's mid-June and properties available August are starting to come on the market. Looking early, especially when relocating, is never a bad idea anyway. You may not get the properties you are looking at but it will give you a better idea of the area and what you can get for your rent range, so that when it is time to make a decision you can be most confident in what you've chosen.
Lawrenceville/ Pennington/ Hopewell are all within my area of expertise. If you have any questions please feel free to reach out to me.
Alexandra R. Hunt
Gloria Nilson & Co. Real Estate - Princeton
Best of luck with your move.