How many weeks does it take to train for a marathon as a beginner?

Most beginner marathon training plans are 16 to 20 weeks long. A 16-week plan works if you already have a solid running base of 20 to 25 miles per week. A 20-week plan gives you more time to build mileage gradually and recover from setbacks, which is better for true first-timers.

What should my long run be before starting marathon training?

Before beginning a marathon-specific training plan, you should be comfortable running a long run of 10 to 12 miles and averaging 20 to 25 miles per week. If you are not there yet, spend 8 to 12 weeks building your base first. Completing a half marathon before your first marathon is a strong foundation.

How do I train for a marathon in Florida heat?

Training in Florida heat requires adjusting your expectations on pace. In summer conditions, your easy runs will be 45 to 90 seconds per mile slower than your cool-weather equivalent — this is normal and not a sign of poor fitness. Train by effort rather than pace, run as early in the morning as possible, carry water on all runs over an hour, and trust that your fitness will show up when race day temperatures drop.

What Florida marathons are good for beginners?

The Ameris Bank Jacksonville Marathon in January offers a flat, fast course in ideal winter conditions and is one of the best beginner marathon options in Northeast Florida. The fall and winter race window from November through March gives Florida runners the best conditions for a first marathon. Browse all Florida marathons on Run Florida Run to find a race that fits your schedule.

How many miles a week should a beginner run when training for a marathon?

Beginner marathon training plans typically peak at 35 to 50 miles per week during the highest-volume weeks. Earlier in the plan, 25 to 35 miles per week is typical. The most important metric is the weekly long run, which builds from your starting distance to a peak of 20 to 22 miles before tapering in the final two to three weeks before race day.

Beginner Marathon Training Plan: How to Train for Your First Marathon

Running your first marathon is one of the most rewarding goals in the sport. It requires months of consistent training, a smart approach to building mileage, and the patience to trust the process. This guide gives you a practical framework for getting from your current fitness level to a marathon finish line — built with Florida running conditions in mind.

Before You Start: Are You Ready?

You do not need to be fast to train for a marathon. You do need to be consistent. Before beginning a marathon training plan, you should be comfortable running at least 20–25 miles per week and completing a long run of 10–12 miles. If you are not there yet, spend 8–12 weeks building your base before starting a marathon-specific plan. Running your first half marathon is an excellent prerequisite.

How Many Weeks to Train for a Marathon?

Most beginner marathon training plans run 16–20 weeks. A 16-week plan is the minimum for runners with a solid base. A 20-week plan gives you more time to build mileage gradually and recover from any setbacks along the way. Pick a race date that gives you the full plan before the event — rushing marathon training is the most common mistake first-timers make.

In Florida, the best marathon race window is November through March, when temperatures are manageable and long runs do not require a 5 AM alarm just to beat the heat. The Florida marathon calendar on Run Florida Run shows upcoming races across the state so you can pick your target event and count backward to your training start date.

The Core Structure of a Marathon Training Plan

A solid beginner marathon plan has four main components:

The long run. The most important workout of the week. You will build from your current long run distance to a peak of 20–22 miles over the course of the plan, with cutback weeks built in to allow recovery.
Easy runs. The majority of your weekly mileage should be at a conversational, easy pace. Going too hard on easy days is what gets most beginners injured.
One quality workout. A tempo run or marathon-pace effort once per week helps develop race-specific fitness without overloading your system.
Rest and cross-training. At least one full rest day per week is non-negotiable. Swimming, cycling, or yoga on easy days supports recovery without additional impact stress.

Sample Weekly Structure (Weeks 8–14)

Here is what a mid-plan training week might look like for a beginner targeting a 5:00–5:30 finish time:

Monday: Rest or 30 min easy cross-training
Tuesday: 5–6 miles easy
Wednesday: 7–8 miles with 3–4 miles at marathon goal pace
Thursday: 5 miles easy
Friday: Rest
Saturday: Long run (14–18 miles depending on week)
Sunday: 4–5 miles easy recovery run

Total weekly mileage in this phase: 35–45 miles. Cutback every 3–4 weeks by reducing long run distance by 20–30%.

Running in Florida Heat: What to Know

If you are training through a Florida summer, heat adaptation is a real part of your preparation. Expect paces to be 45–90 seconds per mile slower than your cool-weather equivalent in peak summer heat and humidity. Do not fight it — train by effort, not pace, and trust that your fitness will translate when race day conditions improve. Early morning starts (before 6 AM in July and August) are non-negotiable for long runs.

Hydration is more critical in Florida than almost anywhere else. Carry water on any run over an hour, and consider electrolyte supplementation on long runs over 90 minutes.

Florida Marathons to Target

When you are ready to pick your race, Florida offers strong options throughout the fall and winter season. The Ameris Bank Jacksonville Marathon in January is Northeast Florida's premier event, with a flat, fast course and ideal winter conditions. Browse the full list of Florida marathons on Run Florida Run to find a race that fits your timeline and location.

Getting Fitted for Marathon Training Shoes

Do not train 16–20 weeks in the wrong shoes. Visit a specialty running store for a proper fitting before you start your plan. You will likely go through two or three pairs of shoes during marathon training, so knowing what works for your foot and gait early saves money and prevents injury. Jacksonville runners can visit any 1st Place Sports or Fit2Run location for expert fitting.

Ready to find your race? Browse Florida marathons and half marathons on Run Florida Run.