Grandma’s Marathon 2027 fueling guide: 15 aid stations, the early bus, Lake Superior weather, and a plan for every finish time

Grandma’s Marathon is on Saturday, June 19, 2027, and the last edition gave runners 15 aid stations on the 26.2 miles (42.2 km) from near Two Harbors to Canal Park in Duluth. Every station had water and Powerade Ion4 Mountain Berry Blast in cups. The only extra fuel was PURE FUEL maple syrup at mile 17 and fresh fruit near miles 19 and 23.5. No gels were listed. So the sports drink is a useful top-up, but most of your carbohydrate has to come with you on the bus. This guide sets out what the organizer has published, when you will reach each station at your pace, and three plans to choose from.

Two things make Grandma’s different from most big marathons. The start is a point-to-point bus or train ride away, with buses loading from 5:15 to 6:15 a.m. last time, so breakfast is very early and you need a plan for the hours in between. And the weather off Lake Superior can be cool and windy or warm and humid, sometimes both in one morning. The 2027 weekend guide is not out yet, so the station list below is based on the last edition’s official weekend guide. The organizer’s FAQ says 2027 on-course fuel details will be announced closer to race day. Recheck in race week.

Grandma’s Marathon 2027: the confirmed race facts

Corral assignments are based on the goal time you give at registration. They are emailed in late May and printed on your bib. You may move back a corral but never forward. That matters for fuel: a Corral C runner starts 25 minutes after Corral A, so every clock time in your plan shifts by that much.

What is on the Grandma’s Marathon course

This is the full list from the last edition’s official weekend guide. Water and Powerade Ion4 Mountain Berry Blast are served in cups at every station, with toilets and first aid. Each station also has purple bins for empty gel packets; the organizer asks runners not to throw them on the road.

The pattern is simple. Up to mile 19 the stations are 2 miles (3.2 km) apart. From mile 19 to mile 25 there is one every mile. So the course is generous with fluid late in the race, when most runners need it, and thinner early, when it is easy to fall behind on carbohydrate.

Powerade lists 21 g of carbohydrate and 240 mg of sodium per 12 fl oz (355 ml), about 6 g of carbohydrate per 100 ml. A cup of 100 to 150 ml gives roughly 6 to 9 g, less whatever you spill. If you drink a full cup at all 15 stations, that adds up to roughly 90 to 135 g over the race. Most runners drink less than that at pace, so count it as a top-up of perhaps 40 to 90 g, not as your plan. PURE FUEL is a 1-ounce pouch of pure maple syrup. Anderson’s product page does not list its carbohydrate grams, so read the pouch label before you count it.

When you will reach each station at your pace

The table shows elapsed time from your own start at an even pace. A 3:00 runner reaches the maple syrup at mile 17 at 1:57. A 5:00 runner reaches it at 3:15, and the last station at mile 25 at 4:46. If that runner started in Corral C at 8:10 a.m., mile 25 comes close to 1:00 p.m., the warmest part of the race.

Pick your plan: three runner profiles

World Athletics’ consensus statement gives 30 to 60 g of carbohydrate per hour as the usual marathon range, and its companion paper on distance runners suggests trained runners try up to 90 g per hour in events longer than about two and a half hours. Research on multiple transportable carbohydrates shows that intakes above 60 g per hour are only absorbed well when the product mixes glucose and fructose and the gut has been trained for it. So here are three honest profiles. With 25 g gels, one every 30 minutes gives 50 g per hour, every 25 minutes gives 60 g, and every 20 minutes gives 75 g.

Racing it: your problem is volume. At 75 g per hour from gels alone, a 3:00 race needs nine 25 g gels. Powerade at race pace is often half spilled, so count no more than a few grams per cup. Build your number over eight to ten weeks of long runs, starting at 60 g and adding 10 to 15 g every second week while your stomach stays quiet. Take the first gel at about 20 minutes, just before the mile 3 station, and the last one near mile 23, before downtown Duluth.

Steady marathon: think in grams. A 4:00 race at 60 g per hour is 240 g. A cup of Powerade at each station might cover 50 to 90 g of that, depending on how much you drink. That leaves about six or seven carried 25 g gels, roughly one every 30 to 35 minutes. Because stations are 2 miles apart until mile 19, put most of your gels in the first 19 miles and let the every-mile Powerade carry more of the load after that. Write the grams next to each item and total each hour.

Long day: five to seven hours on your feet changes the math. Fifty grams per hour over six hours is 300 g, and Powerade covers only part of it. Small, frequent doses work best: a gel every 30 minutes, or half a gel every 15, with maple syrup at mile 17 or a piece of fruit near miles 19 and 23.5 when a gel feels like too much. Keep an eye on the 7-hour pace vehicle. Runners behind it are asked to move to the sidewalk, and aid and water stations close. Eating on schedule in the first three hours is what keeps you ahead of it on London Road.

Caffeine, sodium, and the maple syrup at mile 17

• Caffeine: the ISSN position stand supports 3 to 6 mg per kg taken about 60 minutes before exercise. For a 70 kg runner, 3 mg per kg is 210 mg. With a 7:45 to 8:10 a.m. start, that means around 6:45 to 7:10 a.m., in the start area.
• No caffeinated products were listed on the course at the last edition. If you want a late caffeine dose, carry a caffeinated gel you have tested and check its label for the milligrams.
• Sodium: Powerade lists 240 mg per 12 fl oz, so a 150 ml cup gives about 100 mg. Salty sweaters on a warm, humid day may still want a tested electrolyte product as well.
• PURE FUEL at mile 17 is pure maple syrup in a 1-ounce pouch. It is mostly sugar, so it acts like a gel, but test it in training first; a new product at mile 17 is a gamble.
• Fresh fruit near miles 19 and 23.5 is a nice extra. It is slow to eat while running and will not replace a gel’s worth of carbohydrate unless you take a lot.
• Tear the top of your gel before the station, so you can drink with the same hand.

Hydration for a June morning on Lake Superior

Around June 21, Duluth averages a daily high near 72 °F (22 °C) and a low near 54 °F (12 °C), with about a 34 to 41 percent chance of a wet day across June and only a small chance of muggy air. Lake Superior averages just 44 °F (7 °C) at that time, which is why the shoreline can feel cold at the start and why a wind off the lake changes the day so fast. The organizer’s own advice calls the weather a wild card: perfect cool running weather, heat and humidity, cold wind or rain are all possible, and its blog described runners battling rising heat late in the last edition. The FAQ says severe heat and humidity can lead the race director to shorten or cancel races, and colour-coded Event Alert System flags are posted at the start and at every water station. World Athletics warns against drinking more than you sweat; finishing heavier than you started is a sign of overdrinking.

• Test your sweat rate in one cool and one warm long run in May and early June.
• Hydration vests, fuel belts and handheld bottles are allowed. Vests can hold no more than 8 L overall and 1.5 L in a bladder. Backpacks are not allowed.
• Wear throwaway layers at the start; clothes left there are collected for reuse.
• Pick your priority stations now: every 2 miles early, then the every-mile run from 19 to 25.
• Seek help at a first-aid point at any aid station, or a medical tent at one of the five dropout zones, for confusion, severe headache, repeated vomiting, or collapse, whatever the clock says.

Breakfast and the bus ride before a 7:45 start

A familiar carbohydrate-rich meal one to four hours before racing is the standard framework, and ACSM gives 1 to 4 g of carbohydrate per kg in that window. The Grandma’s timeline squeezes it. Last edition, buses from the Duluth sites loaded between 5:15 and 6:15 a.m., with suggested windows of 5:30 to 5:45 a.m. for Corral A, 5:45 to 6:00 a.m. for Corral B and 6:00 to 6:15 a.m. for Corral C at most sites. The train loaded at 5:00 to 5:45 a.m. and was not expected at the start before 7:10 a.m. Full marathoners may bring their clear gear bag on the bus, so pack your top-up in it. Water and toilets are at the start area, and the organizer warns of long toilet lines.

• 4:15 to 4:45 a.m., about 3 to 3.5 hours before: the main breakfast, a practised meal such as a bagel with jam or honey, oatmeal, a banana and juice, about 1.5 to 2.5 g of carbohydrate per kg.
• On the bus: sip water or a sports drink you know. Bring a small low-fibre snack for later.
• 6:30 to 7:00 a.m., about 60 to 90 minutes before: a small top-up such as a banana, a rice cake or a few chews, about 20 to 40 g of carbohydrate.
• 6:45 to 7:10 a.m.: caffeine, at the dose and timing you have practised.
• 10 to 15 minutes before your corral starts: an optional gel, only if used in training.
• Go to the toilet early, then drink small amounts so you are not back in the line at the gun.

Course tactics: where Grandma’s tempts you

The organizer calls the course relatively flat and fast, with rolling hills and a net downhill. The start sits at about 740 ft (226 m) and the finish at about 610 ft (186 m). These notes follow the official mile-by-mile elevation list.

• Miles 0 to 9: the first three miles drop about 84 ft (26 m), and the trees and lake keep the road quiet. The organizer’s own tips warn that the early downhill and adrenaline make it easy to start too fast. Take your first gel around mile 3, even if it feels early. Miles 8 and 9 climb 37 ft (11 m) in total.
• Miles 9 to 13: mile 10 drops 57 ft (17 m), the biggest single-mile fall. Halfway comes just after the mile 13 station. Steady runners should have three or four gels in by here.
• Miles 13 to 19: rolling road along Scenic Highway 61, with a 20 ft (6 m) rise in mile 17 where the maple syrup is. Fruit is near mile 19, and from there the stations come every mile.
• Miles 19 to 22: the late climbs. Mile 20 rises 30 ft (9 m) and mile 21 another 17 ft (5 m), to the highest point since mile 9. The organizer’s blog names Lemon Drop Hill at mile 22 as the course’s most famous hill: not big, but it comes when your legs are tired. Shorten your stride and keep eating on the clock.
• Miles 22 to 26.2: downtown Duluth, with crowds building around mile 24 near Fitger’s, then the final turn to Canal Park. The finish is farther than it looks when you first see it. Your last carbohydrate should be in by about mile 23.

The long-run rehearsal that makes the plan real

Grandma’s asks you to eat breakfast about three and a half hours before the start and then sit on a bus. Rehearse that. In May, schedule two or three long runs where you eat at the same time as on race day, wait the same gap, have the same small top-up, carry the same products, and fuel at the same clock times. If you plan to use Powerade Mountain Berry Blast or PURE FUEL maple syrup, buy some and test them here. One rehearsal proves the timing works; the next tests it under fatigue, at goal pace for racers and at the full expected time for the long-day group.

The later rehearsals are where you simplify. If carrying eight gels is awkward, lean on Powerade at all 15 stations and carry fewer gels for the last seven miles. If a gel every 20 minutes feels stressful, link your gels to the stations instead: every 2 miles until mile 19, then every second station after that. The best plan is the one you can still follow on Lemon Drop Hill.

Race-week Grandma’s checklist

• Recheck the official weekend guide for 2027 station miles, drinks and the on-course fuel announcement. The organizer’s FAQ says fuel details come closer to race day.
• Note your corral and its start time, and pick your bus loading site in the early-May email so you know your breakfast time.
• Lay out every carried item, add one backup, and write grams and timing on one card. Pack the top-up snack in your clear gear bag.
• Pick up your packet at the Essentia Health Fitness Expo at the DECC on Thursday or Friday. If you go to the spaghetti dinner on Friday, eat what you have practised, not a huge plate.
• Check the forecast 48 hours out and adjust fluid, sodium and layers, not the whole plan.
• Do not buy an unfamiliar gel at the expo because the flavour sounds good.

Frequently asked questions

Sources and update notes

1. 1Grandma’s Marathon (race information and 2026 weekend guide)Grandma’s MarathonAccessed October 25, 2026; June 19, 2027 date, course details, 7-hour limit, elevation by mile, last edition’s start times and corrals, 15 aid stations with water and Powerade Ion4, PURE FUEL at mile 17, fruit near miles 19 and 23.5, hydration pack rules, dropout zones, pacers
2. 2Frequently Asked QuestionsGrandma’s MarathonAccessed October 25, 2026; aid station miles, on-course fuel to be announced, heat and humidity policy, hydration vests and belts
3. 3Participant TransportationGrandma’s MarathonAccessed October 25, 2026; last edition’s bus loading windows by corral, train loading and arrival time, gear bags on buses
4. 4Start and Finish LinesGrandma’s MarathonAccessed October 25, 2026; start area at Sonju Two Harbors, water and toilets at the start, Event Alert System flags
5. 5Finish LineGrandma’s MarathonAccessed October 25, 2026; Canal Park finish in front of the original Grandma’s Restaurant
6. 6Spaghetti DinnerGrandma’s MarathonAccessed October 25, 2026; Friday spaghetti dinner at the DECC
7. 7Top 10 Tips for First-Time Runners of Grandma’s Marathon (February 2025)Grandma’s Marathon blogLemon Drop Hill at mile 22, unpredictable June weather, early downhill pacing, crowds near mile 24 at Fitger’s
8. 8Grandma’s Marathon Weekend: A Celebration of Community, Courage and Every Finish Line (July 2026)Grandma’s Marathon blogDescribes rising heat through the last edition’s race day
9. 9POWERADE Mountain Berry BlastPOWERADE (The Coca-Cola Company)Accessed October 25, 2026; 21 g carbohydrate, 240 mg sodium, 80 mg potassium per 12 fl oz
10. 10Pure Fuel Maple Syrup PouchAnderson’s Maple SyrupAccessed October 25, 2026; 1-ounce single-serving pouch of pure maple syrup; no carbohydrate grams listed on the page
11. 11June Weather in Duluth, MinnesotaWeather SparkJune temperature, wet-day, humidity and Lake Superior water temperature averages (1980 to 2016)
12. 12International Association of Athletics Federations Consensus Statement 2019: Nutrition for AthleticsInternational Journal of Sport Nutrition and Exercise Metabolism (Burke et al., 2019), PMID 30952204Carbohydrate ranges, pre-race meal, and hydration guidance
13. 13Contemporary Nutrition Strategies to Optimize Performance in Distance Runners and Race WalkersInternational Journal of Sport Nutrition and Exercise Metabolism (Burke et al., 2019), PMID 30747558Marathon carbohydrate intake, including up to 90 g per hour for trained runners in longer events
14. 14Nutrition and Athletic Performance: Joint Position StatementAmerican College of Sports Medicine (Thomas et al., 2016), PMID 268911661 to 4 g per kg carbohydrate 1 to 4 hours before exercise
15. 15A Step Towards Personalized Sports Nutrition: Carbohydrate Intake During ExerciseSports Medicine (Jeukendrup, 2014), PMID 24791914Multiple transportable carbohydrates and intakes above 60 g per hour
16. 16International Society of Sports Nutrition Position Stand: Caffeine and Exercise PerformanceJISSN (Guest et al., 2021), PMID 333880793 to 6 mg per kg, about 60 minutes before exercise