Fall is better. Later Aug. BUT- if you really want to have fall clover to attract deer PLUS you do have the time and possibly $ to waste, you could try some now. I would go for a full acre so if some areas don't make it (soil differences, quality, etc) you can at least keep the best area that did survive and re-do the rest in the fall. Goes against conventional wisdom planting now BUT can be done, will depend on rain, soil quality, etc obviously. personally, I'd seed it extremely heavy (some disagreement on that too BUT plant it heavy). I'd also add several different types of clovers.... whites, reds, berseem, alsike and even some alfalfa if you wanted a little. Each has some ups and downs and will help diversify if failure challenges. Can explain more on each if needed. could get on Welters and order several acres worth so you had it for later as well. Seed heavy, do it right & then just realize you may have a failure. Absolutely can work though, I even had success on a poor timed clover plot I did for goofing off on new farm- last year, drought year! But- I wasn't worried if it did fail, no biggy. Obvious other plan in ANY case is your late summer planting. Good luck!