Aintree
National Hunt

Aintree is not one racecourse but three, and you need to be clear which one you are handicapping before you do anything else. The Grand National course — triangular, left-handed, roughly two miles two furlongs round, spruce fences — is a specialist test that most horses will never face; the National itself is two circuits of it, sixteen fences the first time and fourteen the second, and it finishes with a 494-yard run-in that bends at the Elbow, one of the longest and most punishing finishes in British jump racing — though not the longest, a distinction Cartmel claims with a four-furlong chase run-in. Inside it sits the Mildmay chase course, used for most of the chasing here: flat, sharp, left-handed, with conventional birch fences and a run-in of roughly 200 yards — a different finish entirely. Racing Post gives the Mildmay circuit as 1m3f; Wikipedia’s account of the layout when it opened in December 1953 makes it a little over 1m2f; Aintree publishes no official measurement of its own, so read the figure as approximate. And the hurdles are a third track again, a separate left-handed oval of about the same length with six flights to a circuit. Not every source counts three courses — the section below sets out where they part company, and why the going line settles it better than the label does. Conflating them is the most expensive mistake you can make at Aintree.

Flat does not mean easy here, and the best short description of why belongs to a rider. At The Races’ Aintree course guide carries Mick Fitzgerald’s view from the saddle: “Even though it’s flat, it can be very testing for a horse, so you need one that can travel. The winner is almost always still on the bridle leaving the back straight … and those that aren’t really struggle to get home.” That is a jockey’s read rather than a measurement, and this page offers it as exactly that. The Mildmay course is what the form analyst encounters on most visits: sharp bends at both ends, three fences in the home straight with a long run between the last two, and a short run-in after that. The sharpness is not cosmetic — it can inconvenience long-striding, galloping types that need time and space to wind up, and it rewards horses that are agile, travel fluently within their races, and jump without losing momentum on the turns. In the competitive Festival handicaps the pace is usually strong from the start, because a flat track and a big field leave nobody an incentive to dawdle; do not carry that assumption into a small-field Grade 1, a novice race or an ordinary fixture.

This is the first question to answer at Aintree, and the racecard heading does not answer it. The three configurations share a postcode and very little else. The table is the quick version.

Racing Post names the Topham, the Foxhunters’, the Grand Sefton and the Becher as the other races run over the Grand National fences, and Wikipedia’s Foxhunters’ entry puts it more sharply: with the Topham and the National itself, it is one of only three races over those fences at the April Festival. Across the whole season there are five: four handicaps — the National, the Becher, the Grand Sefton and the Topham — plus the Foxhunters’. Everything else at Aintree is Mildmay or hurdle-course form.

One honest caveat, because the sources do not all count three courses. Wikipedia describes a separate hurdles’ course — a left-handed oval of about 1m3f with sharp bends and six flights, three down the back straight and three in the home straight, the oldest of the three and Aintree’s Flat track until the last Flat race was run here in 1976. Racing Post and Racing TV describe Aintree as two courses and treat the hurdle races as Mildmay racing. What settles it for a punter is not the label but the ground: on the Friday of the 2026 Festival, Racing Post reported the Grand National course still good to soft while the chase and hurdle courses had quickened to good to soft, good in places. Two readings, one afternoon, one racecard.

Aintree waters to a target, and the target is on the record. The Jockey Club’s 2019 account of its £1.5 million investment in the turf says the irrigation system is used to regulate the water going onto the track so that the density of the soil is controlled “to ensure it is always at its safest for racing”, which the same page defines as ground on the softer side of Good. The grass is cut to four inches across the whole circuit for cushion, and the ground is de-compacted through the year. That is a groundstaff aim rather than a forecast. It tells you which way the clerk leans; it does not tell you how the ground has actually ridden, and this page has not measured that.

The practical point is that there is more than one reading, and they move at different rates. On the Friday of the 2026 Festival, Racing Post reported the Grand National course as good to soft while the chase and hurdle courses had gone to good to soft, good in places, after 5mm of water had been applied to both tracks overnight. Clerk of the course Sulekha Varma put the difference down to the weather rather than the watering: “there are a few bits on the Mildmay course which have a touch of good”, after a very windy night. Wind and sun shift a watered surface faster than the calendar does, and they do not shift all three configurations together.

The structural argument for pace at Aintree is easy to make: a flat surface lets horses sustain speed without the energy cost of climbing, sharp bends let a leader take the shortest line, and the short Mildmay run-in leaves little time to close. Three published studies have measured it, and they do not all point the same way — which is the finding here, not a nuisance to be averaged away. All three are handicap chases, so none of them speaks to hurdles. They do take in the National fences, though, and in one of them the whole Aintree sample is National-fence racing — which turns out to be the single most useful thing on this page about pace.

The oldest is the most negative. Dave Renham’s geegeez study of handicap chases at 2m1½f or shorter, published in September 2018 with no sample period stated, identified 43 Aintree front-runners and found four of them won — a 9.3% strike rate at an impact value of 0.90, one of only eight British courses in that study below 1.00. The same article’s race counts put the Aintree sample at 31 races, so 43 is leaders, not contests.

His companion piece on the staying trips is where this guide has been wrong. Published in January 2019 and covering 2014 to 2018, it identifies 33 Aintree front-runners at 2m7f to 3m3f, of whom four won: 12.1%, low enough to place Aintree in the article’s poorest strike-rate table. But the article then prints a second table of every course with a front-runner impact value below 1.20 — Fontwell 1.03, Bangor-on-Dee 1.01, Huntingdon 1.01, Sandown 0.95, Wetherby 0.92 — and Aintree is not on it. Renham writes that the remaining 36 courses all have an edge for front runners. The low strike rate is a field-size effect. Renham makes the point himself in the companion short-trip article, where Cheltenham sits 23rd on strike rate and 4th on impact value because, in his words, chases of that type there have many more runners on average than at other racecourses. An earlier version of this section quoted an impact value for Aintree’s staying leaders that the article never gives them — it is the dataset-wide figure for hold-up horses. It has been withdrawn, and so has every conclusion that rested on it. One more thing about that band: at 2m7f to 3m3f it takes in the Becher Chase, run over the National fences at 3m1f188y, alongside Aintree’s Mildmay staying handicaps. How much of the 33 is Becher runners is not published, and is not guessed at here.

The newest study is the most positive, and it is not about the Mildmay at all. Renham’s two-part update, covering 1 January 2017 to 6 October 2024 in handicap chases of seven or more runners, could not table Aintree at 2m5f to 2m6f for want of races, but says of it that four of the 14 races were won by front runners in fields averaging twenty, and that from limited data front runners at Aintree look to have an edge. Read that band against the programme: Aintree has no Mildmay chase at 2m5f to 2m6f. Its chase ladder runs 2m, 2m4f and 3m1f, and every 2m5f chase here — the Topham, the Grand Sefton and the Foxhunters’ — is run over the spruce. Two of those are handicaps, and matching the study window against Aintree’s programme accounts for all fourteen: the Topham was run seven times inside it (2020 was lost to Covid) and the Grand Sefton seven. That last step is our reconstruction rather than a label the study prints, and we would rather show the working than hide it. A twenty-runner average field says the same thing: no Mildmay handicap chase here draws twenty. So the one positive pace figure on this page is a National-fence figure — front-runners have won four of those fourteen, not some middle-distance result on the inner track. Note the narrowness of that: the study reports only the led group for Aintree, because the course did not make its run-style table, so nothing is published here about horses that merely raced prominently. The update’s summary across all four bands is blunter still: only two courses saw front runners at a disadvantage overall, and they were Bangor and Ffos Las.

So there is no track-wide Aintree pace rating worth carrying into a race, and the combined evidence does not support treating the place as generally hostile to front-runners across its courses and trips — though the 2018 short-trip figure above is real contrary evidence at that one trip on the Mildmay. Establish the course, the discipline and the trip first, then read the pace map.

The practical read: there is no track-wide running-style rule to carry into an Aintree race, but there is a configuration one. The one clearly negative published figure is short-trip, is now eight years old and states no sample period; the newest study finds an edge over the National fences and lists Aintree nowhere among the courses where leaders were at a disadvantage. What does still hold is the mechanical point about the Mildmay finish — 200 yards after the last is not long, so a horse still detached at the second-last may simply have left itself too much to do — which is worth checking against its stamina, its jumping and its class before you credit it with an excuse. And remember what a run-style figure is: it classifies a horse as having led once the race has been run. It records what became of horses that got the lead, not the return on backing a horse you expect to lead — and no A/E or starting-price breakdown is published for Aintree in any of these samples. Judge it race by race, from the pace map.