September typically marks the start of the slow season in real estate, but a dip in mortgage rates and a strong stock market kept activity "unseasonably resilient" last month, according to Zillow.

New listings rose 3 percent year over year in September, defying the usual fall cool-off. Even last month's modest 2 percent dip from August was atypical, Zillow noted, as listings have historically fallen an average of 9 percent heading into the fall over the past seven years.

Kara Ng, senior economist at Zillow, attributed September's "surprising stamina" to lower mortgage........

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