Shelter

Anchor a tarp or tent for a storm

Storm anchoring spreads wind loads across more shelter attachment points and uses buried anchors where ordinary stakes will not hold. Use it before strong wind arrives, especially in loose soil, sand, or snow. A deadman anchor works by pulling against a broad mass of ground rather than relying on a narrow stake. Anchor strength still depends on the ground, burial depth, pull direction, and shelter construction; no anchor makes an exposed campsite safe.

Shelter 15 min practice Intermediate Use these techniques in loose mineral soil, sand, or snow deep enough to bury anchors without damaging vegetation. Choose a sheltered, well-drained site outside flood channels, avalanche terrain, and the fall zone of trees or loose branches.

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Topic summary

Key takeaways

The buried anchor shows no creeping or rotation during a sustained test pull in the intended direction.
Guylines remain secure after being loaded, slackened, and loaded again.
Shelter panels are supported with reduced flapping, while seams, poles, and tie-outs remain undistorted.
Anchor positions and balanced line tension remain unchanged at follow-up checks.
Avoid: Burying an anchor shallowly in loose backfill lets it pull out; dig into firmer material, compact the cover, and test progressively in the actual guyline direction.
Avoid: Routing the line upward over the trench lip can lever the anchor out; cut a narrow exit channel toward the shelter.

Intended uses

Shelter skill (Intermediate, ~15 min practice)
Requires: Small shovel or snow shovel, Knife for cutting cord or trimming deadwood, Gloves

Climate suitability

Use these techniques in loose mineral soil, sand, or snow deep enough to bury anchors without damaging vegetation. Choose a sheltered, well-drained site outside flood channels, avalanche terrain, and the fall zone of trees or loose branches.

Safety: Set anchors before conditions become dangerous, and keep guylines clear of walking routes or mark them visibly. If anchors keep moving or shelter fabric begins tearing, move to safer shelter while you can rather than repeatedly tightening the lines.

Required tools

Small shovel or snow shovel
Knife for cutting cord or trimming deadwood
Gloves

Required materials

Low-stretch guyline cord
Sound fallen sticks or blunt rocks
Durable stuff sacks filled with gravel, sand, or snow
Additional stakes suitable for horizontal burial

Step-by-step

Replace stakes with deadman anchors — bury a stick, rock, or stuff sack full of gravel horizontally with the guyline tied around it.
Why: Position the anchor across the pull direction, secure the line around its center, and bury and compact it beneath enough firm material to resist a sustained test pull; this loads a broad area rather than a narrow stake.
In snow, dig a T-slot: cut a channel across the guy direction, lay a stake or stuff sack horizontally, and pack snow over it.
Why: Lead the line from the anchor’s center through the narrow stem of the T toward the shelter so it pulls against undisturbed snow, and let the packed snow firm up before loading it.
Add secondary guylines from mid-panel tie-outs on every wall — not just corners.
Why: Use only the shelter’s reinforced, intended guy points, because these distribute pressure and reduce panel flapping without concentrating force on unsupported fabric.
Angle guylines at 45° from the tarp to the anchor for the strongest pull-through-shear geometry.
Why: Treat this as a rough starting angle relative to level ground, not a universally strongest geometry: follow the shelter’s intended tie-out direction and adjust anchor distance to limit upward levering while supporting the panel.
Re-tension every 2–4 hours during a long storm as ground softens and cords stretch when wet.
Why: Also check after initial settling, heavy precipitation, or strong gusts, restoring firm rather than excessive tension so movement does not develop into anchor failure.

Tip: Cut short (4-inch) toggles from sticks and larks-head your cord around them — they hold better than tied loops when guys need to be adjusted repeatedly.

Common mistakes

Burying an anchor shallowly in loose backfill lets it pull out; dig into firmer material, compact the cover, and test progressively in the actual guyline direction.
Routing the line upward over the trench lip can lever the anchor out; cut a narrow exit channel toward the shelter.
Adding lines to unreinforced fabric can start a tear; use only designated reinforced tie-outs and follow the shelter’s pitching instructions.
Tightening every line as hard as possible overloads seams and poles; balance tension until panels are supported without distortion.
Assuming a short toggle holds better than a tied loop can lead to a slipping connection; if you use a sound, roughly 4-inch stick with a larks-head hitch centered around it, test it under load and after slackening, and use a suitable adjustable hitch or tensioner for repeated adjustment.

Troubleshooting

If an anchor creeps under a steady pull, then reset it deeper in firmer material or use a larger buried anchor before relying on it.
If packed snow will not firm up enough to hold a test load, then seek denser snow or another secure anchoring location rather than trusting the same shallow T-slot.
If a wall keeps snapping in gusts, then check pitch orientation and add or adjust lines at its reinforced panel tie-outs without flattening or distorting the shelter.
If a guyline repeatedly loosens, then inspect the anchor, knots, and tensioner separately and correct the moving component rather than simply pulling harder.

Field practice drill

In about 15 minutes on a calm day, bury one deadman across the expected pull direction, cut its line channel, and compact the cover. Apply a gradually increasing, steady hand pull along the intended guyline angle while watching for movement, then connect it to a reinforced shelter tie-out and balance the tension. Release and reset the line, repeat the test, and uncover the anchor to inspect its position; refill the hole afterward. Practice the T-slot version separately when suitable snow is available.

Indicators of success

The buried anchor shows no creeping or rotation during a sustained test pull in the intended direction.
Guylines remain secure after being loaded, slackened, and loaded again.
Shelter panels are supported with reduced flapping, while seams, poles, and tie-outs remain undistorted.
Anchor positions and balanced line tension remain unchanged at follow-up checks.

Related outdoor skills

Educational reference only. Wilderness conditions change fast — practice in low-stakes settings, take a certified wilderness first-aid course, and confirm regional regulations before you rely on any of these skills in the field.