O'Brien Trail Races

O'Brien Trail Races O'Brien include: 50K, 25K, 10K, and 5K, set in the scenic terrain of O'Brien State Park. The 50K completes this loop twice.

The 25K course loops through the park's west and south sections into Jackson Meadows. The 5K, 10K courses are run in the park. O'Brien State Park
16821 O'Brien Trail North
Marine on St. Croix, MN 55047
Will need a state park pass

50k - will run the 25k course twice
25k
10k - will run the 5k course twice
5k

05/03/2026

Please check out our upcoming races for 2026:

MINDY CREEK
August 29th
St. Croix Falls, WI
Marathon, Half Marathon and 10k

O'BRIEN
Sept 26th
O'Brien State Park, MN
50k, 25k, 10k and 5k

BREAK THE BANK
Oct 10th
Duluth MN
50 mile and 50 mile relay

More info can be found on FB and UltraSignup

See you soon
Jeff

With the forecast for this weekend being a little bit on the cold side I was wondering:Who will be running outside?What ...
01/23/2026

With the forecast for this weekend being a little bit on the cold side I was wondering:
Who will be running outside?
What is your secert for keeping warm and motivated to get out?
If not going outside, what will you being doing?

12/01/2025

Hurry!
Early bird registration ends tomorrow at midnight.

Any looking for this after last week's race?
09/26/2025

Any looking for this after last week's race?

09/21/2025

Wimens 50k winner
Rachel Ragona 4:20:43!

09/21/2025

Mens 50k champion - Robert Santoro
3:58:24

My Grandaughter "helping" me with pre race announcements.
09/21/2025

My Grandaughter "helping" me with pre race announcements.

Photos from a fun filled day!
09/21/2025

Photos from a fun filled day!

09/21/2025

Womens Winners
Anna Gunderson
And
Stephanie Cloutier
1:59:25
COURSE RECORD

09/21/2025

Mens 25k winner
Tony Kraftson 1:59:16

Address

16821 O Brien Trail North
Marine On Saint Croix, MN
55047

Opening Hours

Monday 6am - 10pm
Tuesday 6am - 10pm
Wednesday 6am - 10pm
Thursday 6am - 10pm
Friday 6am - 10pm
Saturday 8am - 10pm
Sunday 6am - 10pm

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