The Independent Electoral and Boundaries Commission (IEBC) planned the second election after the Supreme Court determined the re-election of President Uhuru Kenyatta on August 8 was tainted by irregularities.
Thursday the commission set back the date by nine days because the Supreme Court's detailed ruling this week indicated how the new elections should be conducted and the technology should be used, commission chairman Wafula Chebukati said.
The court said the electoral commission failed to properly verify the results.
Following the Supreme Court's judgement, Mr. Kenyatta had vowed to "fix" the court if re-elected, since in his view his country had "a problem" with its judiciary.
Explaining why it annulled Kenyatta's win, the Supreme Court said its order to view the computerized data was "a golden opportunity" for the electoral commission to present evidence to debunk Odinga's claim of interference.
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He said the Cabinet had approved the budget for fresh elections, expected to cost some 10 billion shillings ($96 million).
The chief justice of the Supreme Court, David Maraga, said this week that the judges have received death threats.
"Access was only provided on the August 29, 2017 without ability to access the logs or even view them".
The petitions claim misconduct and bias.
The judges said IEBC did not transmit presidential results (or forms 34A) from polling stations nor provide all forms 34A as a means to verify forms 34B which contain constituency tallies. But more precise details have yet to be released ahead of the court's full report, due on Thursday.
In a statement, the commission said presidential election will be held afresh on October 26 instead of the October 17.
The company which provided the electronic system for the first election says time is already tight to have everything ready by the 31 October constitutional deadline.
His statement also accused police chief Joseph Boinnet of not providing adequate security to judiciary staff, suggesting that he "repeatedly ignored calls to act, exposing judicial officers, property and litigants in danger".