Asphalt prices are tracked by several governmental and state departments, including the Louisiana Department of Transportation and Development.
The indexes are just an indication where the overall blacktop prices are going and are meant for the asphalt industry.
For retail pricing, these are negotiated individually for each project, and depend on several things, including the size of the project and distance from the asphalt plant, and statistics for these prices are not published.
The asphalt hot mix prices do give an indication as to where the prices are going and how they've developed in the past, even for the retail market and can assist in making timing decisions into paving with asphalt.
One thing to note is how the prices usually develop very much correlating with oil prices, as oil by-products are one of the main ingredient in asphalt.
One of the best indexes in the country that show how blacktop prices have developed comes from the California Department of Transportation.
The California Statewide Paving Asphalt Price Index is determined each month by the Department using the median of posted prices in effect on the first business day of the month as posted by Chevron, Exxon Mobil and Union 76 for the Buena Vista, Huntington Beach, and Midway Sunset fields.
Louisiana Department of Transportation and Development publishes 'price index' for asphalt in their region, for use in making price adjustments for asphalt cement and fuels used in construction contracts.
Same applies to the The West Virginia Department of Transportation (WVDOT):
Massachusetts Highway Department releases their price index for use on all MassHighway construction contracts that contain special provisions for Price Adjustment for Hot Mix Asphalt Mixtures and / or special provisions for Price Adjustment for Diesel Fuel and Gasoline.
From Asphalt Prices page to Asphalt Guide index