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CalcSpan/Photography, tides and astronomy/Hiking Daylight Turnaround Calculator
Photography, tides and astronomy · Calculator

Hiking Daylight Turnaround Calculator
without the guesswork.

Hiking Daylight Turnaround Calculator — Derive local sunset, test both hike legs and set a latest turnaround with a daylight buffer. Uses a focused calculator with visible assumptions. Inputs stay in your browser.

Reference toolHiking Daylight Turnaround CalculatorDerive local sunset, test both hike legs and set a latest turnaround with a daylight buffer. Inputs stay in your browser.
Reference calculation
Inputs

Enter your details.

Your inputs are processed locally and are not uploaded to CalcSpan.

Browser location stays on this device and is used only for this calculation.
Fri, Aug 21, 2026
Use my current location below, or paste trail coordinates from a map.
Include daylight-saving time at the trail.
Include breaks and route-finding.
Use a slower return estimate when descent or fatigue may matter.

Plain-date semantics · start date is not counted unless the result explicitly says inclusive.

Your result
Plan has 5 hrs 14 min of buffer

The calculator derives sunset from the trail coordinates, then tests the planned outbound and return legs against the selected safety buffer.

Hike dateAug 21, 2026
Sunset20:14
Daylight cutoff19:141 hr before sunset
Planned turnaround12:00
Planned finish14:00
Latest safe turnaround17:14Allows 2 hrs to return plus the selected buffer
Latest safe start15:14Assumes 4 hrs of moving and break time
Coordinates47.6062, -122.3321 · UTC-7

Read before relying

Context matters.

  • Enter conservative leg times that include breaks, route-finding and the slowest member of the group.
  • Terrain can hide the sun before the geometric sunset. Weather, injury and navigation errors can consume the entire buffer.
  • Carry a headlamp and an emergency plan; this tool is a planning check, not a guarantee of safe passage.
Rule set 2.0.0

Sources & scope

Verified

This page shows the source trail, jurisdiction and review date alongside the result. Always confirm time-sensitive rules with the linked authority.

CalcSpanPlain-date calculation method and input semanticsRetrieved 2026-08-20NOAA Global Monitoring LaboratoryGeneral Solar Position CalculationsRetrieved 2026-08-20
JurisdictionGlobal solar/lunar planning — user-provided coordinates and date-specific UTC offset
Review date2027-02-21
PrivacyNo input upload
Questions answered

What to know before using the result.

What is the latest safe turnaround?

It is sunset minus the entered return-leg time and safety buffer. Turn earlier when terrain, weather, pace or navigation adds uncertainty.

Should I include breaks in the leg estimates?

Yes. Use conservative times that include breaks, route-finding and the slowest person in the group.

Does finishing before sunset mean a hike is safe?

No. Terrain can hide daylight early, and delays can consume the buffer. Carry lighting, navigation and an emergency plan.

Keep going

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