In just one week, runners will be crossing the finish line on Boylston Street while hundreds of thousands of spectators cheer them on throughout the marathon route.
And once again, security will be tight in the wake of the 2013 bombings.
Just like in 2014, there will be security checkpoints near the starting line and finish line, and organizers are asking spectators to not carry backpacks, coolers or glass bottles.
[CLICK HERE to see the full list of Boston Marathon policies.]
"To the extent that people need to carry possessions with them, please carry them in clear, plastic bags," said MEMA Director Kurt Schwartz.
While security will be similar to last year, there is one important new rule to remember.
"The entire course this year will be a no-drone zone," Schwartz said.
With 30,000 runners registered for the 119th Boston Marathon, the BAA is asking so-called "bandit runners" to stay off the course as well.
"It presents a very legitimate security anxiety for everybody who is both watching the race and in the race," said BAA Executive Director Tom Grilk.
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There will be about 3,500 uniformed officers in the eight cities and towns along the marathon route, along with plain-clothed officers and several surveillance cameras.
But Massachusetts State Police Colonel Timothy Alben says they're counting on the public to be their eyes and ears too.
"It's 26 miles and you never get risk to zero but you work exceedingly hard in compressing that risk as much as you possibly can," he said.
