The mansion will be open to the public with no reservations required on May 1 and May 8 from 10 a.m. to 3 p.m.
Tourists will see the original paint and wallpaper schemes in the 1810 house -- including in the second-floor ballroom.
Jarrot was a fur trader and land speculator whose grand home reflects the owner's regional importance.
Jarrot helped explorers Lewis and Clark find winter quarters in 1803 before the pair set out on their expedition to the West.
On the Net: http://jarrotmansion.org/