Stock futures were barely budging ahead of the first day of testimony by Federal Reserve Chairwoman Janet Yellen to Congress on Tuesday, with some wary she may strike a hawkish tone on the timing of the next interest-rate hike.

Also ahead, Case-Shiller home prices and a consumer confidence index are due to be released, as are a handful of earnings reports. Shares of Home Depot Inc. and Toll Brothers Inc. were both higher after separately releasing results.

Futures for the Dow Jones Industrial Average (DJH5) added 17 points to 18,102, while those for the S&P 500 index (SPH5) were flat at 2,107.40. Futures for the Nasdaq-100 index (NDH5) traded up 0.5 point to 4,445.