Why US Lumber Prices Diverge from Global Markets
Despite operating in a globally connected commodity market, US lumber prices frequently trade at a significant premium — or occasionally a discount — to global softwood log benchmarks. Three forces drive this divergence:
Canadian lumber tariffs. The US levies countervailing and anti-dumping duties on Canadian softwood lumber imports, which typically range from 8% to over 20%. Since Canada supplies roughly a quarter of US lumber needs, these tariffs create a direct floor under domestic prices that global buyers do not face. When duties increase, the US PPI can spike independently of the IMF benchmark.
Domestic production constraints. US sawmill capacity is tied to timber harvests on federal and private land. Environmental regulations, wildfire disruption, and mill closures can throttle supply quickly. Unlike steel or concrete, lumber cannot be easily substituted or stockpiled at scale — so supply shocks amplify price swings beyond what the global market reflects.
Housing boom demand spikes. During periods of intense homebuilding activity — particularly 2020–2022 — US framing lumber demand surged faster than domestic mills could respond. The result was an historic price spike that dwarfed movements in the global softwood log index, which tracks raw log exports rather than processed dimensional lumber delivered to US job sites.
How to Read the Price Index
Both series are normalized so that the average value in 2019 equals exactly 100. This lets you compare percentage changes on the same scale regardless of the underlying units (PPI index points for FRED; USD per cubic meter for IMF).
A reading of 125 means prices are 25% above 2019 levels. A reading of 80 means prices are 20% below the 2019 average. When the two lines track closely, US and global markets are moving together. When the US line climbs well above the IMF line, domestic supply or tariff pressures are at work.
The US series (FRED WPU081) is derived from monthly producer price data, which is averaged into annual figures here to match the annual frequency of the IMF series. Both series are based on data released with a lag — the most recent year shown may reflect preliminary estimates.
Data sources: Federal Reserve Bank of St. Louis (FRED) — series WPU081 · IMF Primary Commodity Prices — PSOFTLOG (Softwood Logs). Data updated annually. Not a substitute for supplier quotes.