Classic Races within 400 miles of Thornton, CO on Sundays
City Location
Featured Listing
1. Boulderthon: Downtown Boulder Marathon
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Sep 28, 2025Sunday
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26.2M, 13.1M, 10K, 5K run | kids run
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Boulder, CO
Boulder County, CO
121. Healthy Kids Running Series - Erie
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Past DateSep 15, 2024Sunday
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kids run
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Erie, CO
13 miles point to pointWeld County, CO
122. Healthy Kids Running Series - Aurora
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Past DateSep 15, 2024Sunday
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kids run
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Aurora, CO
12 miles point to pointArapahoe County, CO
123. Healthy Kids Running Series
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Past DateSep 15, 2024Sunday
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kids run
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Trinidad, CO
189 miles point to pointLas Animas County, CO
124. Healthy Kids Running Series - Denver
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Past DateSep 15, 2024Sunday
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kids run
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Denver, CO
9 miles point to pointDenver County, CO
125. Pony Express Run
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Past DateSep 15, 2024Sunday
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15M trail run
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Woodland Park, CO
61 miles point to pointTeller County, CO
126. Race Against Suicide
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Past DateSep 15, 2024Sunday
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5K, 3K run
Virtual OptionMore Information
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Colorado Springs, CO
72 miles point to pointEl Paso County, CO
127. RRCC Front Nine 5K
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Past DateSep 15, 2024Sunday
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5K run
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Morrison, CO
19 miles point to pointJefferson County, CO
128. Run for the Nuns
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Past DateSep 15, 2024Sunday
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5K run
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Holladay, UT
367 miles point to pointSalt Lake County, UT
129. Tiger Prowl
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Past DateSep 15, 2024Sunday
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5K run
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Lakewood, CO
13 miles point to pointJefferson County, CO
130. TyRUNnosaurus 5K
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Past DateSep 15, 2024Sunday
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5K run | kids run
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Albuquerque, NM
342 miles point to pointBernalillo County, NM
131. Corrales Ditch Run
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Past DateSep 22, 2024Sunday
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13.1M, 10K, 5K run
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Corrales, NM
331 miles point to pointSandoval County, NM
132. Golden Gallop
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Past DateSep 22, 2024Sunday
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10K, 5K run | kids run
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Golden, CO
15 miles point to pointJefferson County, CO
133. Healthy Kids Running Series - Denver
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Past DateSep 22, 2024Sunday
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kids run
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Denver, CO
9 miles point to pointDenver County, CO
134. Healthy Kids Running Series - Aurora
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Past DateSep 22, 2024Sunday
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kids run
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Aurora, CO
12 miles point to pointArapahoe County, CO
135. Healthy Kids Running Series
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Past DateSep 22, 2024Sunday
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kids run
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Trinidad, CO
189 miles point to pointLas Animas County, CO
136. Healthy Kids Running Series - Erie
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Past DateSep 22, 2024Sunday
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kids run
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Erie, CO
13 miles point to pointWeld County, CO
137. Old Baldy Run
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Past DateSep 22, 2024Sunday
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10K trail run
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Spearfish, SD
324 miles point to pointLawrence County, SD
138. Red Feather Trail Jamboree
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Past DateSep 22, 2024Sunday
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13.1M trail run
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Red Feather Lakes, CO
72 miles point to pointLarimer County, CO
139. RMRR Fall Marathon Training Series
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Past DateSep 22, 2024Sunday
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20M, 10M run
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Thornton, CO
Adams County, CO
140. Second Wind Walk/Run
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Past DateSep 22, 2024Sunday
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5K run
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Littleton, CO
18 miles point to pointArapahoe County, CO
For the love of all that Is good And moisture wicking...
Though we Try To be accurate And On top Of things... Race details can change When we aren't lookin. And once in a while we simply make a mistake.
ALWAYS visit the race's website for the most complete and accurate race information.
ALWAYS visit the race's website for the most complete and accurate race information.