Elland were celebrating on Sunday but the champagne remained on ice for neighbours Blackley.
The Hullen Edge club clinched the Division Three title with one match left by beating a 10-man Old Crossleyans side by four wickets.
Matthew Browes made 56 as the visitors totalled 167, Alex Farrar taking three for 16. Courtenay Richmond then hit 99 not out to seal an impressive season for a young Elland team, the beaten Rod Warhurst Cup finalists.
In Division One, Blackley were unable to pick up the 20 points they needed at bottom club Booth to be crowned champions.
They did win, collecting 15 points from a two-wicket success, but second-placed Illingworth bagged maximum points in a seven-wicket victory over visitors Norden.
Sheel Hamid’s unbeaten 111 helped Booth to 215 for six. He put on 102 for the first wicket with Seb Holmes. Blackley surged to 183 for two but Steve Ashton’s dismissal for 59 triggered a collapse. However, Marcus Roberts saw them home with 79 not out.
Norden recovered from 64 for six to 182 but 17-year-old Elliot Mercer produced some blistering strokeplay in reply. The youngster raced from 50 to 100 in only 22 balls for his first century at senior level. He finished on 135 not out, sealing victory with a six.
Rastrick were thrashed at Lightcliffe but relegation rivals Southowram were unable to overtake them, losing by nine runs at home to Triangle in spite of 90 from opener David Jowett.
The Rams gave a debut to 13-year-old Bradford Ladies and Yorkshire prospect Amy Gibson, picking up her first senior wicket.
In Division Two, Northowram Fields recovered from 42 for six to win at Barkisland, aided by 96 from Heath Philipson and 102 not out from Eddie Fairbank.
Promotion rivals Bradshaw crashed by 179 runs at SBCI, for whom Matthew Bamford (103) and 14-year-old George Hampshire (88) figured in a big stand.