Oooohh wow you’ve only had one year of French?
Okay, if you’re serious about your plan you need to accelerate to a level of basic proficiency in two years.
It means, if you’ve got good grades, apply to the Middlebury highschool language program over the summer and start French 4 or AP Fall 2017.
You can also apply to the Penn state intensive French language or the Ole Miss Intensive language summer programs and take levels 1-2-3 to start in French 4 Fall 2017. Those two programs aren’t as selective as Middlebury 's.
You can also enroll in Concordia language programs, either Voyageur or one of the villages or the village+ abroad program. That would allow you to start French 3 Fall 2017.
Another solution would be to do Concordia language camp then take College French 2 and 3 through dual enrollment.
Last, most intensive option : If you took Middlebury 's or Penn State or Ole Miss programs you could start straight in college French 3 or 4 (200-level classes) Fall 2017 and complete one 300 level class in the Spring.
It’s doable but hard and you have to measure how invested you are in the idea if spending a year in France.