Could my colt get this mare pregnant?

Ok, so I'm moving before too long. And my colt, Lakota, will be staying with my boyfriend until about november or december when I get my lisence and can work to pay board for him. My boyfriend has a 2 1/2 or 3 year old paint mare. My colt is not gelded, as I'm waiting until both testicals drop. He has one, half descended. I'm also waiting until next winter when flies are gone and the cold helps with the swelling. Now, he has about 100 acres but keeps the mare in a pen because he worries about her getting caught up in wire that's laying around in the pasture. My colt would be in a pen with her, could he get her pregnant? I think he can, but I'm not sure if she's let him anyway. I would hate for this mare to get pregnant this young.
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Yes, he absolutely can.
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YES - they must not be pastured together until he is gelded and, even pastured separately, must be contained with a good spacing between their respective fence lines/areas by fencing that is substantial enough to keep a breeding minded male and female apart.

Yes he can. Do not put them together. You will end up with a pregnant mare.

Of course she'll let him, and absolutely he can get her pregnant.

Ok thank you! I was pretty sure he could but wanted to be sure. Her fencing is pipe, about 4 and a half feet tall. Maybe I could keep him in with the goats. That way he still has a barn. I'd have to ask though.
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4 1/2 foot fencing, regardless of materiel, will not keep the two of them sufficiently contained/separated.

Well I'm estimating, I know when she tries to put her head over the fence it comes to the middle top half of the neck.
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Geld him.

Well he isn't descended yet, and fly season is at it's worst right now! I'd rather not make him miserable.
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