HostMonster does offer a 30 day free trial. At the end of the free trial, your account will automatically renew. However, if you do not wish to continue with HostMonster, you can cancel before the end of the 30 day free trial and you will not pay a dime. They advertise that there are no term commitments, no hidden fees, and no penalties for ending your plan early. This means you can try out HostMonster risk-free!

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If you cancel after 30 days you receive a prorated refund for the remainder of your hosting term.
Money-back guarantee applies to hosting plans, but does not apply to most add-on products, such as domains, given the unique nature of their costs.
There are no term commitments associated with your HostMonster account. There are no hidden fees or penalties for ending your term early should you elect to do so.