Half marathon in September

Summer of Malmo

Goals and time commitments b4 plans

I am not too sure, a race calculator predicts a 1:25 which I think is a little optimistic.

17:45 shows you have pretty decent speed but there is big difference between the 5K and the Half. I'm a good 5K guy with terrible half marathon times. I would suggest getting up to a max 15 mile long run and running the last two miles hard or at tempo pace. This is probably the most important workout. I found out an easy 13 mile long run was not sufficient enough, as I died at mile 11.

Stuff like 4 x 1 miles in the middle of a 10 mile run is also good, as well as 3 x 2 miles.

The half marathon predictor workout is 4 x 2 miles (2 minute standing rests). The average of that workout is your half marathon pace.

Up your mileage to 55-ish and you should crush race

Just going off of the name are you in HS & plan on doing this during your cross season? Out of high school & wanting to try the longer stuff?

17:45 projects to 1:21. Your 3k is a touch better. If you're serious about the half then don't worry about a time goal. You can run well under 1:25. Over the summer focus on being consistent with a little more mileage if you can handle it. Focus on long runs. Focus on strength workouts that you probably haven't been doing a lot of. Instead of 5 x 1k @ 5k w./ decent rest, do 8-10 x 1k @ T w./ 1:00 rest. Do a regular 80-90min long run. Build to 100-105min. Incorporate 3-5 miles @ something around what marathon pace would be (6:30ish). Really just need 1 hard (tempo/threshold) workout/week, decent mileage (45-60min on ez days), and a good long run. Get strong then set your goals. Adjust workouts in the heat, knowing it'll cool off for the half in September.