The paper discusses he dynamics of the cycles of long-monitored (1971–2012) wood grouse population inhabiting the experimental unit of the All-Russia Research Institute of Game Management and Fur Farming, as well as the dynamics of the cycles of 12 other populations in the Novosibirsk region that were subject to monitoring from 2000 to 2012. The population sizes were estimated using annual walk-through surveys conducted according to uniform methods. The chronograms were tested for latent harmonic components. The districts involved in the walk-through survey were attributed the spectra of population dynamics and evaluated in terms of periods and the power of the harmonic components of each spectrum. It was identified that the spectrum of the population dynamics was comprised of eight pronounced harmonic components differing in amplitude and power; the most powerful components referred to periods of 4.5 and 14.9 years. The relationship between the rate and the power of the dynamics of the wood grouse population cycles differs depending on the district of the Novosibirsk region. Moreover, there is a trend of increasing durations of low-frequency cycles in the northern direction. The sites inhabited by wood grouses feature natural environmental rhythms that can influence (prolong) the population cycles of this species.