With the final match next month at Blackburn, second-placed Harriers can take the title if they win that match and Wakefield come no higher than third.
With one thrower stuck in traffic, coach Peter Warden stepped in and competed in the hammer.
Team managers David Rigby and Caroline Warden also filled in gaps left by absent athletes. The former won the 5,000m and was second in the steeplechase, while the latter took part in the discus, high jump and 4x400m relay.
Sophie Warden won the B triple and long jumps as well as taking part in the 100m and 4x100m relay.
Becky Rigby dominated the 3,000m and 1,500m, winning in 9.44.8 and 4.41.6 respectively as well as running a leg of the 4x400m relay.
Rachel Scott and Eleanor Ward won their 800m races, as did Daniel Bebbington and Dougie Ashcroft, while Patrick Dever was victorious over 1,500m.
Ed Jeans set a new senior hammer record of 52.72m, breaking the old record by nearly 10 metres in winning the event.
Amy Lupton won the javelin with a season’s best throw of 39.02m, as well as the triple jump with 11.16m.
This year’s Skiddaw Fell Race included the uphill England trial for the Home International on July 30.
Nichola Jackson was the sixth lady to the top and her fast descending speed won her the race in 1.24.56.
Tony Livesey finished in 1.28.48 for 55th position.
The annual Lostock Hall Carnival 5K saw Harriers’ Gary Pennington (16.35) in third spot ahead of Stephen Bonsu (19.45), Dominic Moon (19.54),Victoria Duckett (21.37) and Alan Littler (23.56).
Six Preston Harriers travelled to Bowness for the Windermere Triathlon.
Kevin Hunt (27th, 2.35) led Harriers home, ahead of Billy Johnstone (2.37), Steve Needham (2.44), Chris Wales (2.52), Steve Townhill (2.55) and Michael Brennand (3.14).