I would recommend building up your mileage for the first half of summer at least, towards the end add in some faster workouts like reps and tempos. Definitely work in a long run every week to build up all summer, and make sure you have plenty of recovery runs. I would also recommend to limit speed workouts to once or twice a week and don't run two hard runs in a row. (Alternate between hard and easy.) Try to be creative with your mileage, if you run the same way every day all summer you risk an overuse injury. If you're injury prone like me do more cross training like biking as a replacement. Basically you want to take it slow enough that you don't injure yourself, because injuries can really throw you off your game. Another good idea to prevent injuries is to build in a flexibility and strength routine.
Try to build up to running at least six times a week, and if you can, more. They don't have to be long right away. You will get used to being sore a lot, and possibly fatigued, but don't overdo it! If it hurts its better to miss a run than to derail your whole training plan for the summer.