It's all about your stats. If you play other sports, video is also highly important. Colleges are going to want to see exactly how you play; all the stuff that doesn't show up in statlines. The thing about track and field is that there are no intangibles.

There's a right way to throw a javelin and then there's every other way to do it. If you're doing it wrong, your distances aren't going to be high enough for scholarship territory. The bottom line here is: if your scores are good enough for a scholarship, you're going to know it as soon as your coach says, "Your scores are good enough for a scholarship!"

What? You want exact numbers? Well, how about we go for some of the biggest events in track? The 400-meter, the pole vault, and the discus? Let's throw in the decathlon for men and the heptathlon for woman. All of the scores will be the bare minimum. You'll want to do a little better for any kind of guarantee. Or as close as you can get to one.

For the 400-meter:
Men need 51 seconds for DI, 54 for DII, and 53 for DIII
Women need 60 seconds for DI, 68 for DII, and 1:04 for DIII

For the pole vault:
Men need 14'6" for DI, 12' for DII, and 13' for DIII
Women need 10' for DI, 8' for DII, and 9' for DIII

For discus:
Men need 155' for DI, 120' for DII and DIII
Women need 120' for DI and 100' for DII and DIII

For the decathlon:
Men need scores of 6,000 for DI and DII, and 4,000 for DIII

For the heptathlon:
Women need scores of 4,000 for DI, 3500 for DII, and 3000 for DIII

(Source)

Again, these are bare minimums to even qualify. No guarantee of actually getting in.

Because track and field isn't a marquee sport like, say, basketball or football, there's not much in the way of recruitment. A school is going to see your performance on the field as a bonus rather than a reason to recruit you. Also remember to keep that GPA higher than a 3.0 and an SAT score over 1,000 (source). That's just good advice in general.