On average how much is insurance for a 250cc Honda CRF 250L?

I was looking into buying one but I need a know if saving money on gas and car is even worth it if insurance makes up the other half it'd cost for a car/ lots of gas?

There's no "on average". There are many factors that determine insurance costs. You give none apart from the model of bike.
Your age. Your sex. Your address. Your occupation. Where the bike is kept. Your driving experience. Your claims history. Age of the bike. Etc etc
Get the picture?

There's no such thing as average. The insurance on the vehicle you mention will vary from individual to individual and from insurance company to insurance company and from location to location and on and on and on… The only way you can ever know what insurance might cost you is to ask an insurance company