More than 900 women, along with some 6,000 men, are seeking seats on 284 municipal councils whose powers are restricted to local affairs including streets, public gardens and rubbish collection.
The vote has been hailed as a small step forward in the conservative Islamic kingdom, one of the most restrictive countries in the world for women.
But many voters said tribal allegiances -- rather than a candidate's gender -- would be a big factor in the ballot.
Um Mohammed, a 47-year-old woman living near the Kuwaiti border, said her daughters had helped organise the campaign of a female candidate, but she herself would back a man.
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Her husband had dinner with the candidate at his campaign tent, helping to confirm their choice, she said.
Such tents -- traditional male gathering places in Saudi Arabia that can be as large as houses -- have been a common way for candidates to get their message across during Saudi municipal elections.
Ballots for local councils have taken place twice before, in 2005 and 2011, with only male candidates and voters.
Um Mohammed may have chosen her candidate but whether she makes it to the polling station on Saturday is another matter.
Unable to drive and with no taxis in her community, Um Mohammed said she can only vote if her husband takes her, or if a group of women rent a car and driver together.
Saudi Arabia is the only country in the world where women are not allowed to drive. They must also cover themselves in black from head-to-toe in public and require permission from male family members to travel, work or marry.
A slow expansion of women's rights began under the late king Abdullah, Salman's predecessor who died in January.
Many have welcomed female participation in the ballot as a step forward for women's rights.
The campaign has been a struggle however, with some women candidates barred from taking part and others withdrawing under pressure.