Smith comfortably came home first in Wednesday’s run at Saltram Park, having also triumphed in May and April’s races.
On a hot evening, Smith clocked 16 minutes and 54 seconds, with Plymouth Harriers’ Rikki James second in 17.17.
Sixth overall, and first women, was City of Plymouth’s Poppy Tank, who is back in the UK after completing her first year at the University of Utah.
Tank clocked 18.12 minutes for the multi-terrain run around the National Trust property.
Second female home was fellow City of Plymouth athlete Paula Simson, who finished in 21.40.
Great Britain age group cross duathlete Sharn Hooper was third in 22.10.
Full results can be found HERE.