Trionium Greensand Marathon

A very tough, challenging and scenic off-road marathon, taking in many of the tops of the Greensand hills of the North Downs, and usually benefitting from spectacular autumn colours. Not for the feint-hearted, and with a tough and strictly-enforced 73-minute cut-off for the quarter way point, the race includes a mile of ascent and descent.

Anyone interested?


  • The date of the race is 21 October 2012....!
  • Just entered - perfect warm-up for Snowdonia the following weekend....
  • Gah! You are mad! I ran (just) the Coventry half a few years ago, the week before Snowdonia, and did I ever regret it. In fact, I stopped twice involuntarily on the Snowdonia, and felt like crying (I didn't though, let's just get that clear, right?). Snowdonia is a tough old race, even without a tough race the week before!

    The Greensand will be quite some warm-up!
  • What's the idea of the73 minute cut-off at 1/4 distance? Do you have to reach 1/2 way by 146 minutes and so on?
  • Dr RobertDr Robert ✭✭✭
    The idea was/is to get the slowest runners around the course within 6 hours. Hours of daylight, safety, that sort of thing. Last year it was 70 minutes.
  • I can't resist.......simply one of the very best marathon courses in Britain. Snowdonia is a whole 6 days later so should be a breeze. And I'll probably still be crippled from the Picnic anyway!
  • Does anyone have any tips with regards pacing for this? I'm baffled as to how to approach it.

    I did the half in 1.40 and the approach then was just to run to the best of my ability throughout. No pacing as such.

    I suspect that might be a bad strategy over the full marathon distance. I was pretty knackered at the end.

    I'm happy ticking along at 7 minute miles on the flat for 10 miles and am adding distance now and also some grown up hills as well so I'm ok with the distance.....just not the pace.

    Should I pick a target HR and stick to that?

  • Dr RobertDr Robert ✭✭✭
    First quarter: mostly up
    Second quarter: up and down (to the half way turnaround point)
    Third quarter: up and down, but mostly up (a tough section)
    Fourth quarter: mostly down, but with a couple of nasty uphills

    The Greensand is certainly more than twice as tough as the Leith Hill!
  • Tempted,  but I have Beachy Head the following Saturday.  How are the hills compared to that?
  • Dr RobertDr Robert ✭✭✭
    People who have done both say that this is slightly tougher... Still, doing this might be the ruination of a good BHM!
  • I'm in.  It'll be my second marathon, the South Downs marathon in a months time will be my first... 

  • I'm in as well. Can't praise Trionium events highly enough: always hard (I've done the Picnic twice) but always with something special in there as well.

  • I completed the South Downs Marathon last year, which too had elevations in excess of 5,000ft. How does the Greensands Marathon compare with the South Downs? Does anyone know, please?

  • For Greensands are we talking about 5000 feet of up, or 2500 feet of up plus 2500 feet of down?! I feel like it makes a difference : )

  • is it an out and back route?


  • Just answered my own question (this reading all the page may catch on)

  • Thank you, Jonnio1, for the info. Up and onwards it is then!!

  • I just completed the Picnic last weekend, how does the Greensand compare?

  • I did Greensands last year, and the Picnic last week.

    Greensands is much easier, its runnable whereas only a freak of nature can run all of the Picnic. The course is lovely.


    I need to convince the GF that we need a weekend in Surrey in October, and then I'll be back!


  • Dr RobertDr Robert ✭✭✭

    <span class="Apple-style-span" style="font-family: 'Trebuchet MS', Trebuchet, Arial, helvetica, sans-serif;">Have any runners got a garmin or garmin connect profile of the course? Please send it to me at - thanks!

  • I entered this a few weeks ago as I'm running the Luton Marathon in November and wanted to try something different in the run up. However I ran the RH Holmbury Hill Half last Sunday and was amazed at the sheer number of climbs. I ended up run walking a time of 2:06.Suddenly this event is now the big one. Is this similar in terrain and how does anyone have training tips for hilly trail endurance runs? I am a 1: 41 half road runner.
  • I did the Leith Hill 1/2 in March and it was a great event, so have entered Greensands. Has anyone else done both and, if so, what should I expect in terms of time comparisons between the 1/2 and the full marathons?

  • I cant find my confirmation for entering this race! I enter so many I can't even remember if I entered it or not lol. is there an E-mail address I can use as I can't find anything on the site? what confirmation has anyone else recieved?

    Paul. (hangs head in shame!)

  • Paul, try info @ trionium dot com.
  • Paul, you are in! (Runner list to 4 September now on the web site, under 'Runners').

  • Nice one, thanks for that. I can relax now image

  • Rob, just FYI, although the runners list is available at, there's no actual link to it from the Greensand Marathon main page.

  • Hi Rob, Are you still looking for a rpute profile?

  • route profile?

  • QBQB ✭✭✭

    Just entered - couldn't resist with this now the weekend before BHM and having found the Picnic this year to be such a great day (I was going to use 'enjoyed' and 'run' but they really aren't appropriate for the Picnic!)

    I'll read through last year's comments to get a sense of what tot expect, but will aim to keep with the masses through to Leith Hill to make the cut off and then ease off completely and try and save whatever I can for BHM...!

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