| September |
| Sep 29 | 3rd Annual MAINEiacs Charities Half Marathon & 5K | Bangor |
| Sep 29 | Harborfest 5K | Boothbay |
| Sep 29 | Vast Run for Veterans | New Gloucester |
| Sep 29 | Tim’s Run | Yarmouth |
| Sep 28 | Eliot Festival Days 5k | Eliot |
| Sep 28 | Falmouth Foreside 5K Classic | Falmouth |
| Sep 28 | 10th Annual Manchester Apple Festival 5K Road Race | Manchester |
| Sep 28 | Hebron Academy Cross Country Meet | Hebron |
| Sep 28 | Monmouth Apple Fest 5k | Monmouth |
| Sep 28 | 2nd Karen’s Walk & 5K | Rockland |
| Sep 28 | 6th Annual Hugs from Haley 5K | Scao |
| Sep 28 | Fight Back Festival Combat Cancer Run | New Gloucester |
| Sep 28 | Our Hearts 5K | Waterville |
| Sep 27 | 20th Annual Rise ‘N Shine Road Race | Augusta |
| Sep 27 | Lincoln Academy Cross Country Meet | New Castle |
| Sep 25 | Bond Brook 5K Trail Race Series (updated 9/25/2013) | Augusta |
| Sep 25 | Bond Brook 5k Trail Series – Race #8 | Augusta |
| Sep 25 | Coastal Running League Cross Country Meet | Falmouth |
| Sep 22 | Find Your Way 5K | Gorham |
| Sep 22 | Portland Trails Trail to Ale 10K | Portland |
| Sep 22 | Seaside 4-Miler Kittery PTA | Kittery Point |
| Sep 22 | Viking 5K | Sears Island |
| Sep 22 | Common Ground Fair 5k Footrace | Unity |
| Sep 21 | 13th Annual Ogunquit Beach Lobster Dash 5 Miler | Ogunquit |
| Sep 21 | Dash for Dogs 5k | Auburn |
| Sep 21 | 9th Annual Mount Desert Island YMCA Fall 5K | Bar Harbor |
| Sep 21 | 36th Annual Mount Desert Island YMCA – Bar Harbor Bank & Trust Half Marathon | Bar Harbor |
| Sep 21 | FROLIC FOR FLIPPERS 5K | Biddeford |
| Sep 21 | U. Of Southern Maine XC Invitational | Gorham |
| Sep 21 | 6th Annual Massabesic Mustang 5k | Waterboro |
| Sep 20 | KVAC Boys & Girls SC Meet @ Leavitt HS | Turner |
| Sep 20 | KVAC Boys & Girls XC Meet @ Leavitt HS | Turner |
| Sep 19 | Bond Brook 5k Trail Race Series | Augusta |
| Sep 16 | Falmouth Middle School Cross Country Meet | Falmouth |
| Sep 15 | Bob Boucher Memorial 5K | Auburn |
| Sep 15 | 911 Memorial 5K Run/Walk | Gorham |
| Sep 15 | hear ME run 10K | Portland |
| Sep 15 | Bradbury Bruiser – 12 Mile Trail Race | Pownal |
| Sep 15 | Somerset Sports & Fitness Triathlon | Skowhegan |
| Sep 14 | Komen Race For the Cure | Bangor |
| Sep 14 | Bowdoinham Chicken Run | Bowdoinham |
| Sep 14 | Robbie Foundation 5K | Portland |
| Sep 14 | Run For the Trees | Augusta |
| Sep 14 | Run2Give | Lewiston |
| Sep 14 | 2013 Whisker walkand 5K | Rockland |
| Sep 14 | Strive 5k | South Portland |
| Sep 14 | University of New England Invitational | Biddeford |
| Sep 14 | First Annual Terrier Classic Invitational | Waterville |
| Sep 8 | Dan Cardillo Memorial 5K | Falmouth |
| Sep 8 | Lake Auburn Half Marathon | Auburn |
| Sep 8 | Freeport Half Marathon & 5K | Freeport |
| Sep 8 | Susan G. Komen Race for the Cure (updated 9/8/2013) | Portland |
| Sep 8 | Pumpkinman Half Iron Triathlon and Aquabike | South Berwick |
| Sep 7 | Karo 5K for Brain Aneurysm Awareness | Portland |
| Sep 7 | Pumpkinman Sprint Triathlon | South Berwick |
| Sep 6 | Greely High School Cross Country Meet | Cumberland |
| Sep 6 | KVAC XC Meet ~ Edward Little vs Lewiston HS | Auburn |
| Sep 2 | 51st Annual Bangor Labor Day Road Race | Bangor |
| Sep 2 | Caribou Labor Day 8km | Caribou |
| Sep 1 | Labor Day Classic | Biddeford |