When can I jump?

I began cantering last month and I'm wondering when I can start jumping?

I think I started cantering after 6 months of riding and jumping around 9/10 months of riding? I don't really know, it depends on your trainer and when you're ready.

When you can do all 3 gaits without stirrups, trot and canter ground poles in a half seat without tipping forward or backwards and can control your horse's stride, then you can think about crossrails. Slow and steady will go a long way toward jumping correctly and safely. It's not something you want to rush.

I didnt start gridwork until 4 years into my riding, and 6 years until I was doing small jumps. I think giving flatwork a go for at least a year will be a huge benefit.. it gives you time to develop a really solid seat, which is important for any riding :) As myboypuck said, lots of groundpoles are the first step.. you really need to nail those before you even think about jumping

I live in Stockholm, Sweden wheere her is the best place for jumping whit my horse?

I started jumping big jumps 1 yr into my training. With a horse I rode almost 7 days a week and 6 months into my training I was jumping small cross rails without my stirrups. I would say when ever you think your horse is secure enugh in his canter I would go ahead! Has he ever jumped before? If so I would say if you are ready also go for it!

Jumping is often rushed into. Slow and steady will benefit you more in the long run. None of us will be able to tell you when yo uare ready though as we don't know what your riding ability is.

I agree that you don't want to rush into it. You need to be able to do walk trot canter without stirrups and have a solid two point and jumping position. ;)
I started jumping three years into my training. My barn doesn't like to rush things. I was going to start jumping after a year, but I wasn't confident enough and after that, they realized I wasn't ready and held it off until a couple years later. :)

I didn't start jumping anything within the first two years of my riding, I had to be able to do everything without stirrups and reins, be able to go over ground poles w/t/c without stirrups in a two point and count the strides out loud.

Got to agree with everyone else, jumping is not something you want to rush into! There's never a timeline with riding. You're ready to move up when you're ready to move up. It's all dependent on how much you ride, how athletic/strong you are, how quickly you pick it up, etc etc. My students aren't allowed to canter until they can maintain a proper position at all times AND do a posting trot without stirrups for at least one lap around the ring. They can jump when they can securely canter without stirrups AND steer at the same time (circling, cutting across, etc). Moving up when you aren't ready is flat out dangerous and irresponsible.