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Do the 10ks take away runners from the halfs?


Well-Known Member
Original Poster
This started in the W&D thread, moving it to it's own thread to avoid totally dumping on that one.

@Texas84 was suggesting that the addition of the 10k race is what was causing the registrations for the halfs to drop. And was threatening to post numbers if the time/motivation arose. So consider this your motivation. ; )

@LAKid53 said we should be able to just look at the finisher counts to see.

And below follows my thoughts

Except that the results just show finishers. Doesn't show people who failed to finish for whatever reason, nor does it break down the challenge vs non challenge. Last time I checked, the challenge runners were only reflected in a PDF, and not broken out in the individual race totals. And of the challenge runners, there is no break down on those who ended up only completing one or the other for whatever reason. (Yeah, I'm being nitpicky about actual vs approx, but when I do demographics for events stuff like that matters)

But ok, lets compare 2016 and 2017 Tink. (Chosen since its the default on the results tab) 2016 had 8,369 10k finishers, 2017 has 8,623 finishers. 2016 had 13,144 half, 2017 had 10,799 half finishers. 2016 had 94 pages of challenge racers, 2017 has 98 pages (with approx 45 per page). So I think we can assume that the number of challenge runners were a wash, but 2,345 more people finished the half in 2016 than in 2017, while only 300 more people finished the 10k in 2017. And of those 300, almost 200 were challenge runners. So thats 2,000 more total participants in 2016 than in 2017, all of which had done the half. Now admittedly Tink had a 10k from the start, but each year (except for 2017) there were just about 13,000ish half finishers, and about 8,400 10k finishers. 2017 had a huge drop.

DLR (Year, 10k, half finishers)
2013 7,839 15,872
2014 9,608 15,979
2015 9,049 15,248
2016 9,006 13,084
Now not knowing registration numbers, I would still believe that from 2013-2014 they added approx 1,800 slots. But no corresponding drop in the half. But last year, with no apparent increase to the 10k, 2,164 less people finished the half.

Now those are both West Coast races, and neither set of data contains any numbers from non-10k weekends (Tink because it doesn't exist, and DLR because I'm lazy and it's not on trackshackresults at the same place as those years). So please, if anyone else has the data from the races, as well as other years handy, please post them for all to see. My posted data is a small subset and could easily have been selected to show one side (although it wasn't, it was just handy) so I'd love to see more to help further discussion and thoughts. More data is always good data.


The wand chooses the wizard, Mr. Potter
Premium Member
Yes, Challenge results are presented in a PDF. But you can still get results for just the 10k and just the Half.

To really compare, we need registration and start line numbers, in addition to finishers. Without registration numbers to compare to, we really won't know the answer.


DVC Fan Boy
Premium Member
Do they take away from the half? Some races yes, some no. But that's actually a good thing for runners isn't it?

Some of the older races have non-finishers listed but I don't think they are significant to the trends. Paris also listed registration and finisher numbers.

I've got the numbers and pretty graphs ready and I'll get them posted soon. They will just be finisher numbers.


Premium Member
I would think you'd need to have the data - pre 10 km race - of the number of people who registered for a half and didn't start as well as the number of people who started but DNF.

I would imagine that a person who was daunted by the idea of a half marathon would be more likely to go with a 10 km if available - it's cheaper (it is, isn't it?) and the training is less onerous. To be honest, just from personal experience and motivation, I am not sure that I would have done the DLP half last year if there had been a 10 km option, because the idea of a half marathon scared me - I'd never run before, was not athletic and I was approaching 50. In the end, I'm glad there wasn't a 10 km option because it allowed me to set a larger goal to celebrate turning 50, which gave me a greater sense of accomplishment then a 10 km ever would have. And in the process I learned that I actually liked running!


Active Member
In the case of the January races - the half still sold out (not asfast as the 10k, but still sold out quickly compared to non-anniversary years).