The Key Base Training Benchmark That Can Set You Up for a Strong Marathon Build

Consider two runners thinking about signing up for a marathon. One runs two or three miles sporadically once or twice throughout the week, then powers through a 10-miler on the weekend. The other hasn’t yet run double-digit miles at one time, but they get out the door four times per week, checking off three- or four-mile easy runs with a six-mile weekend long run.The first runner certainly has the flashier response to the question, “What’s your longest run?” But their training logs tell different stories.Singular heroic efforts don’t prepare you for a marathon. A successful plan requires you to stack easy runs, recover from hard workouts, and return week after week to build upon your foundation.For marathon hopefuls, preparedness depends less on how far you can run at one time and more on whether you’ve established a routine that you can build on for better fitness.Ahead, you’ll discover the minimum number of times you should run per week before starting marathon training, why frequency can provide a stronger readiness signal than a standout long run, and how to tell when you’re actually ready to begin a traditional 16- to 20-week build.Aim for at Least 3 to 4 Runs per WeekRunners should log a minimum of three to four runs per week before beginning a traditional marathon training block, Alysha Flynn, an RRCA-certified run coach and founder of What Runs You, and Kai Ng, a USATF- and RRCA-certified run coach, previously told Runner’s World.The coaches also pointed to a minimum weekly mileage of roughly 20 to 25, but the more important takeaway is distributing the mileage throughout the week.Why Frequency MattersHow many times you run—and the resulting overall weekly volume—matters more than the distance of one individual run, Ng says. Running regularly increases valuable time-on-feet, helping you build endurance without concentrating too much stress into a single session.A consistent schedule in your base training phase also reveals whether you can recover well enough to handle the rhythm of marathon training. Dragging yourself through a 10-mile run is one thing. Finishing it strong and feeling ready to run again a day or two later is another. A traditional training plan requires the latter over and over again.This distinction separates the two runners from the opening example. The first runner has covered the longer distance, but the 10-miler makes up a disproportionate amount of their weekly workload. The second runner has already practiced spreading that workload across multiple days, recovering between runs, and returning for the next one.As Flynn previously told Runner’s World, when someone says they can run 10 miles, the very next question should be: What does the rest of their week look like?How Consistency Prepares You for the Training AheadLogging three to four weekly runs helps you establish where running fits among your work schedule, family life, strength training, sleep, and other circumstances.For example, Christine Rockey, an RRCA-certified run coach and principal lecturer at Coastal Carolina University, previously told Runner’s World if someone can train to run three miles, they can train to run a marathon. The distances require vastly different workloads, but the underlying consistency principles are similar.Building toward three miles often requires running at least three times per week, Rockey explains. In doing so, you learn how to fit running around your other responsibilities and return consistently enough to make progress. Your marathon base training should reinforce that same habit on a larger scale, so running three to four times per week already feels routine before formal training adds mileage and intensity.The Best Ways to Build Your Running FrequencyIf you’re like the first runner—currently running sporadically once or twice a week before completing a big weekend long run—focus on distributing your mileage evenly.Especially during base training, trim down your long run and redistribute those miles across an additional running day. For example, instead of a 10-miler on the weekend, do a six-miler, with two three-milers earlier in the week. This strategy increases your frequency without raising your overall weekly mileage, Alison Marie Helms, PhD, UESCA-certified running coach and founder of Women’s Running Academy, previously told Runner’s World.Once this balanced schedule feels manageable, begin gradually adding miles to runs throughout the week. The goal is giving your body time to adapt to running more often while still preserving recovery.Flynn says some runners may need only two months of consistent baseline training, though three months or longer remains ideal. By the time week 1 of marathon training arrives, running three to four times per week should already feel like a normal part of your life.The plan will require you to build mileage and intensity, but it shouldn’t also force you to completely redesign your routine. That’s why frequency is such an important readiness benchmark.Matt Rudisill is an Associate Service Editor who has been with Runner's World since 2025. A Nittany Lion through-and-through, Matt graduated from Penn State in 2022 with a degree in journalism and worked in communications for the university's athletic department for three years as the main contact and photographer for its nationally-ranked cross country and track & field teams. Matt was also heavily involved in communications efforts for Penn State football, men's basketball, and women's gymnastics. In his role with Runner's World, Matt has interviewed Olympians, world champions, and countless experts in the field to create service content that helps runners of all ages and experience levels train smarter and race faster. When he’s not out jogging, Matt can be found tweeting bad takes about the Phillies or watching movies.