20-Week Napa Valley Marathon Training Plan

Napa, CAMarch 7, 2027

Start around October 18, 2026. The calendar below gives each phase a real date, then the course guidance shows where to make the build specific to Napa Valley Marathon.

The Napa Valley Marathon runs 26.2 miles down the Silverado Trail from Calistoga to Napa with four turns in the entire race, all of them inside the final four miles. You drop about 303 feet net, a figure the organizers publish themselves, and you climb 564 feet along the way, which is the part people forget.

Race day
March 7, 2027
Start window
October 18, 2026
Runway
20 weeks
Course
Downhill · Point to Point
Plan choice
Current training

Does this window fit your starting point?

Use the longer window to make the early build calmer, not to add five months of hard training. The plan should begin close to your current load, hold most running easy, and delay the biggest race-specific work until the middle of the cycle.

  • You want a longer foundation phase before marathon-specific training.
  • Your current mileage is steady but below the load you expect to carry later.
  • You prefer gradual long-run growth with regular step-back weeks.
  • You can sustain a five-month routine without turning every week into a peak week.

The 20-week Napa Valley Marathon calendar

These dates define the job of each phase. Your current mileage, recent longest run, experience, goal, and available days still decide the actual workouts inside them.

Foundation

Weeks 1–6

Oct 19, 2026–Nov 29, 2026

Set the routine, grow easy volume gradually, and finish each week with enough control to repeat it.

Build

Weeks 7–13

Nov 30, 2026–Jan 17, 2027

Extend the long run, introduce race-specific terrain, and keep recovery weeks on the calendar.

Peak

Weeks 14–17

Jan 18, 2027–Feb 14, 2027

Complete the most demanding race rehearsals and settle fueling, pacing, shoes, and clothing before taper begins.

Taper

Weeks 18–20

Feb 15, 2027–Mar 7, 2027

Reduce the load, keep familiar running in the week, and let the work from the previous four months show up on race day.

Make the window specific to Napa Valley Marathon.

Build general durability first. Add the race's hills, flat sustained running, downhill exposure, heat, or humidity in layers after the weekly rhythm is stable, then make the final long runs the most course-specific.

Read the full race guide

How to train for the Napa Valley Marathon

Train for the Napa Valley Marathon by building downhill durability and tolerance for rhythm that never breaks. The course sheds 867 feet across 26.2 miles, which loads your quads eccentrically for three straight hours, and it runs almost entirely in one direction on one road, so nothing interrupts your stride.

Do the quad work early and often. Run gentle grades, one to three percent, at goal pace or a touch faster, with a short quick stride and no braking. Six to eight of these across a build changes how mile 20 feels here. And don't skip climbing: there are 564 feet of it, in small rises that arrive when you've already been descending, so put short uphill segments inside those downhill sessions.

Then practice the monotony on purpose. Find the longest uninterrupted road you can and run 16 to 18 miles of it with no turns, no stoplights and no change of scenery. It sounds trivial and it isn't. With no turns for 23 miles you get no rhythm breaks and no landmarks to chop the race into pieces, so have a plan for what you do with your head between aid stations.

Napa Valley Marathon course facts

Course
Point to Point · Downhill · Road/Pavement
Elevation gain / loss
564 ft gain, 867 ft loss
Highest / lowest point
395 ft / 56 ft
Marathon finishers
1,942 in 2026 (mid-size field)
Boston qualifier
Certified Boston qualifying course
Finishers running a qualifying time
12.5% in 2026
Typical race morning
45°F at the start, 88% humidity, mostly cloudy
Race day high / low
60°F / 42°F on average

Sources

Let your current training decide the actual plan.

Current mileage, recent longest run, marathon experience, goal, and available days determine which plans rank first. After you choose and subscribe, Stride dates every workout through March 7, 2027.

Build My Plan

20-week Napa Valley Marathon plan questions, answered.

When should I start a 20-week Napa Valley Marathon plan?

The 2027 Napa Valley Marathon is scheduled for March 7, 2027, so the 20-week window opens around October 18, 2026. Treat that as the outside edge of the window, then line week one up with the plan's normal weekly rhythm.

Is a 20-week plan long enough for the Napa Valley Marathon?

Use the longer window to make the early build calmer, not to add five months of hard training. The plan should begin close to your current load, hold most running easy, and delay the biggest race-specific work until the middle of the cycle. The course does not change the opening load you can handle, so choose from your current mileage and recent longest run before adding race-specific terrain.

How should I prepare for the Napa Valley Marathon course in 20 weeks?

Build general durability first. Add the race's hills, flat sustained running, downhill exposure, heat, or humidity in layers after the weekly rhythm is stable, then make the final long runs the most course-specific. Train for the Napa Valley Marathon by building downhill durability and tolerance for rhythm that never breaks. The course sheds 867 feet across 26.2 miles, which loads your quads eccentrically for three straight hours, and it runs almost entirely in one direction on one road, so nothing interrupts your stride.

What if the 20-week Napa Valley Marathon window has already started?

Do not double weeks or cram missed mileage into the remaining calendar. Use your current mileage, recent longest run, experience, goal, and available days to choose a plan that can enter at an appropriate point while preserving the taper.

Is the Napa Valley Marathon downhill?

Net downhill, yes, but not steeply. The Napa Valley Marathon drops 303 feet net from Calistoga to Napa, with 867 feet of descent and 564 feet of climbing along the way. It runs from about 395 feet down to 56 feet, so the grade is gentle and continuous rather than dramatic.

What is the Napa Valley Marathon cutoff time?

Six hours, enforced strictly, which works out to 13:44 per mile. Runners who haven't reached mile 22.7 by 12:45 p.m. are shuttled to the finish. The race starts at 7:30 a.m. on the Silverado Trail at Brannan Street in Calistoga. Check that against a realistic finish time before you enter.

Put the 20-week window against your actual race.

Each page counts back from race day, maps the 4 phases to real dates, and applies the window to that course and its typical conditions.