When does a Growth spurt happen? What age does it start for girls?. How long does a growth spurt last?

It starts at different times for different people. There is no official age as it varies a lot. I hit my first major growth spurt at 12 but don't worry if you haven't gotten one yet. Maybe you will just be short. Being short is awesome.

Mine happened in the fifth/sixth grade. But some girls don't hit their growth spurt until later. But I've been around the same height since 6/7 grade

It depend on your genes

You can tell when your growth spurt is about to happen here are some things that will happen: You will sleep a little longer, You will notice your clothes are getting a little loose on your waist and Your feet might get a little bigger! But growth spurts happen at different times and many times! Heres when they mostly happen: 1-5 -5-8 8-10 -10-13 -13-18 etc. It depends on what time you started growing like if you started growing a lot when you were 4 maybe your biggest growth See More spurt will be when your 14 its different some people have different times but mostly its around those times.