FPInnovations conducted four separate underburns in August 2017 at the CBCFS research site north of Fort Providence, NWT. The burns were part of a fireguard for a future burn but allowed FPInnovations and the GNWT to study how and when underburning can be applied in a pine stand to reduce the potential spread of wildfire and lower the probability of embers landing and starting new fires. Underburns can also be used as lines from which to ignite backburns. To find the optimal fire weather and fuel conditions in which to burn, we burned four fires under different fire weather conditions and documented the resulting fire behaviour and the effects of the underburns.