The squiggles have a purpose
A trail map can tell you more than where to turn. On a topographic map, contour lines join points at the same height. When those lines sit close together, the ground changes height over a shorter horizontal distance. Widely spaced lines generally show a gentler slope. Check the map's legend before comparing routes.
Find the uphill in the route
Trace the whole path, not just the start and finish. Look for sections where the route crosses many contour lines. Note whether the main climb comes early or late. Two trails can have the same distance and a similar endpoint while asking for very different days outside.
Read the numbers as well
The contour interval is the height difference between neighboring lines. A map with a different interval may look less crowded without showing easier terrain. Also check whether heights are given in feet or meters. This is one place where the small print is doing useful work.
A map is not today's trail report
Contours do not show current mud, storm damage, closures, or how clear the path will be. Pair the map with current information from the park or land manager. Choose a route that fits your group and experience, carry navigation you know how to use, and change plans when conditions call for it.
Related Reading
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- Pool Length Changes the Distance You Swam
- Plan the Turnaround Before the Trail Gets Interesting
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