Close to 9,000 runners are taking on the big 26.2 tomorrow some for their first and others for their 58th time.
Jenaya Schmidt is one of those first time runners but she's not your typical racer.
"I haven't even run a half marathon yet so that's kind of weird, went from a 5k to a marathon," she said.
The thirteen-year-old from Fergus Falls has been training to run twice as many miles as she's spent years on Earth, making her this year's youngest Grandma's Marathon runner. It's a fact that even surprised her.
Running alongside her family, Schmidt said she'll rely on their experience to get her through something not everyone can do.
"My dad's running the marathon and all my other siblings are running the marathon and very few people ever run marathons," she said.
But even more experienced runners like Jeannine Julson like to keep it in the family.
"I have five children, four of them run have run marathon and my son still runs and does triathlons," she said. "He's running but he's faster."
At 88 Julson will be the oldest racer hitting the course Saturday morning and even has the famous grandma mascot beat.
"I'm a great Grandma," she said.
With a goal time of less than seven hours, Julson knows she won't be shattering any course records but she said the feeling she gets after she goes the distance makes it all worth it.
"I'm slow and I enjoy it," she said. "I don't think I'm an inspiration at all not at all."
So whether these runners are 13, 88 or somewhere in-between, the goal and the motivation are the same: the exhilaration of earning that finisher's title.
Runners as young as 12 can register with a parent's permission but there is no upper limit when it comes to Grandma's registrations. As long as runners feel they can meet the course limits, they can sign up.
Julson said she's been a part of Grandma's with her family since 1983 and doesn't plan to stop anytime soon.