What to Put Under a Tent When Camping: Full Guide

Most campers spend considerable time choosing the right tent but give little thought to what goes beneath it. That gap matters. The ground under your tent is the source of moisture, cold, abrasion, and uneven pressure — all of which affect both the lifespan of your gear and the quality of your sleep. What you put under a tent when camping determines how well your floor holds up over seasons of use, whether condensation seeps in during wet nights, and how rested you feel in the morning.

This guide covers every layer from the ground up: site preparation, ground cloths, tent footprints, sleeping pads, and how to combine them correctly for different conditions.

Preparing the Ground Before Anything Else

Clear the Site Thoroughly

Before any layer goes down, the site itself needs attention. Small rocks, pine cones, roots, and sticks that seem harmless during setup become noticeable pressure points after an hour of sleep, and some are sharp enough to work through a tent floor over time. Spending five minutes clearing the footprint area is the single most effective form of floor protection available — and it costs nothing.

Look beyond obvious debris. Compacted soil with small embedded gravel is one of the more common causes of tent floor wear because the abrasion is constant and invisible. If the ground feels rough underfoot after clearing, that is a signal that additional protection beneath the tent floor will pay off.

Read the Drainage Before You Pitch

Low-lying areas collect water during rain, and a tent pitched in a natural drainage channel will have water pooling beneath the floor — and eventually seeping through it — regardless of what ground protection you have in place. Before pitching, trace the natural contours of the surrounding terrain and identify where water would flow during a downpour. Avoid depressions, flat areas between slopes, and the base of hills where runoff concentrates.

A site on slightly elevated ground or a gentle slope drains naturally and keeps the space beneath the tent floor dry even during sustained rain. For more detailed guidance on choosing and preparing a site correctly, the camping 101 guide to setting up a campsite covers site selection, drainage reading, and full camp layout.

Ground Cloths and Tarps: The First Layer of Protection

What a Ground Cloth Does

A ground cloth is any sheet of material placed between the tent floor and the ground surface. Its job is to intercept abrasion from rocks and rough soil, block moisture wicking upward through ground contact, and create a clean, stable base for the tent to sit on. Without one, the tent floor takes the full brunt of the terrain on every trip.

Ground cloths are particularly valuable on rocky terrain, in areas with sharp gravel, on ground that stays damp after rain, and on any surface where you cannot fully clear debris before pitching. The tarps and shelters collection includes a range of waterproof ground cloth options in different sizes and weights for various camping styles.

Using a Tarp as a Ground Cloth

A standard polyethylene or nylon tarp works as a ground cloth and is widely available at low cost. The critical rule is sizing: the tarp must be folded so that no edge extends beyond the perimeter of the tent floor. Any exposed tarp edge that sticks out beyond the tent acts as a rain gutter, channeling water underneath the tent rather than away from it. This is one of the most common and easily avoidable moisture problems in tent camping.

Fold excess tarp material under the tent floor rather than cutting it. This allows you to reuse the tarp in different configurations while keeping all edges tucked beneath the tent where they cannot collect water. Reflective or reinforced tarps offer additional durability on rough terrain where basic polyethylene wears through quickly.

Tent Footprints: The Better Solution for Most Campers

Why a Footprint Outperforms a Generic Tarp

A tent footprint is a ground cloth cut and sized specifically to match the floor dimensions of a particular tent model. Because it matches the floor exactly, there is no excess material to fold, no risk of edges collecting water, and no guesswork about coverage. Brand-specific footprints from manufacturers like Big Agnes, NEMO, and Hilleberg are designed to match their corresponding tent models with attachment points that keep the footprint aligned during setup and through the night.

The material used in purpose-built footprints is also typically more durable per gram than generic tarps. Ripstop nylon and reinforced polyester footprints resist abrasion more effectively at lower weight, which matters for backpackers counting every ounce. Footprints are available through the tent and shelter accessories collection alongside stakes, guylines, and other ground-layer gear.

Footprint Sizing and Placement

Whether using a brand footprint or a trimmed tarp, placement matters as much as sizing. Lay the footprint flat, align its corners with where the tent corners will sit, and confirm orientation before inserting poles. Once the tent is raised and staked, check that no footprint edge is visible outside the tent perimeter. Walk around the tent after setup and tuck any exposed edges inward — even a few centimetres of exposed material at a corner can collect enough water during a rainstorm to create a puddle beneath the floor.

On soft or sandy soil, a footprint also prevents the tent floor from sinking unevenly into the ground under the weight of occupants and gear, which keeps the sleeping surface more level through the night.

Sleeping Pads: The Layer That Matters Most for Sleep Quality

Insulation from the Ground Up

A sleeping pad is the layer that directly affects how well you sleep. Its primary function is thermal insulation — the ground conducts heat away from the body far more efficiently than still air, and even on summer nights, ground contact without insulation causes noticeable heat loss. The R-value rating indicates insulation effectiveness, with higher numbers providing better thermal protection. Summer camping on dry ground generally requires a minimum R-value of 2, while shoulder-season trips benefit from R-3 to R-4, and winter conditions call for R-5 or higher.

Therm-a-Rest has defined the sleeping pad category for decades, and their lineup spans everything from ultralight inflatable pads for backpacking to full-thickness self-inflating pads for car camping. The broader sleeping pads and pillows collection covers options across R-values, weights, and pack sizes for every camping context.

Pad Types and When to Use Each

Closed-cell foam pads are often used as a base layer beneath an inflatable pad in cold conditions. The foam provides puncture protection for the inflatable pad above it and adds insulating R-value that stacks with the inflatable. This combination is common for three-season backpacking in variable conditions and essential for winter camping where ground temperatures can drain body heat rapidly even through a high-rated pad alone.

Pad Width, Length, and Fit

A pad that does not cover the full length of the body leaves the legs and feet in contact with the tent floor and ground — a common source of cold spots during the night. Standard pad lengths accommodate most sleepers, but taller campers and side sleepers benefit from wide or extra-long options. Confirm that the pad covers from shoulder to at least ankle before committing to it for colder conditions.

The pad should also fit within the tent floor footprint without folding against the walls. A pad that is too wide for the tent creates buckling along the edges, which reduces effective contact with the sleeping surface and introduces cold gaps. Check tent floor dimensions against pad dimensions before purchasing if sleeping space is tight.

Combining Layers for Different Conditions

Three-Season Setup

For most three-season trips on varied terrain, the standard setup is: cleared and level ground, footprint or trimmed tarp sized to the tent floor, and a mid-range inflatable or self-inflating sleeping pad. This combination handles moisture protection, abrasion resistance, and thermal insulation adequately for temperatures above freezing. Keeping it simple also keeps pack weight manageable for trips where the tent system is being carried rather than driven to the site.

The camping tents collection includes three-season designs from brands that offer matching footprints, which makes the ground layer decision straightforward — choose the footprint paired with your tent model and the sizing problem is already solved.

Cold-Weather and Winter Setup

Cold-weather camping demands a more deliberate ground system. Ground temperatures can drop well below air temperatures in exposed or high-altitude sites, and a single inflatable pad may not provide sufficient insulation even at a high R-value rating if punctured or incompletely inflated. Layering a closed-cell foam pad beneath an inflatable pad creates redundancy: if the inflatable loses pressure during the night, the foam still provides insulation and the trip is not compromised. For guidance on building a complete cold-weather sleep system, the guide on how to stay warm while camping in a tent covers layering strategy from the ground up.

Wet and Rainy Conditions

In sustained rain or on permanently damp ground, a waterproof footprint or tarp beneath the tent floor is not optional — it is the primary barrier against moisture seeping through floor seams and pooling under the sleeping area. Even tents with high waterproof floor ratings benefit from a ground layer that keeps standing water away from the fabric entirely. Pair the footprint with a high-quality sleeping bag rated below the expected low temperature, since a wet floor that brings down sleeping bag loft through absorbed moisture will reduce its effective warmth rating significantly. Details on selecting a tent with proper floor protection for rain camping are covered in the best tent for camping in the rain guide.

What Not to Put Under Your Tent

Cotton blankets and household rugs are frequently improvised as ground layers, but both absorb moisture readily and hold it against the tent floor for extended periods — the opposite of what a ground layer is meant to do. Once saturated, they add significant weight, dry slowly, and create the ideal environment for mold growth on tent floor fabric. Wool retains some insulating value when wet but still holds moisture against the floor and is not a practical ground cloth material.

Bubble wrap and foam exercise mats provide some insulation but compress quickly under body weight and do not offer meaningful moisture protection. They also tend to shift during the night, leaving gaps at the edges where the floor contacts bare ground. If weight and cost are constraints, a basic closed-cell foam sleeping pad is a more practical and durable alternative to household improvisation.

At Appalachian Outfitters, you will find a full range of tent footprints, ground cloths, and sleeping pad systems to match whatever terrain and season you are camping in — everything needed to build a ground layer that protects your gear and improves your sleep from the first night out.

References

REI Co-op. (2024). Tent footprints and ground cloths: Do you need one? REI Expert Advice. https://www.rei.com/learn/expert-advice/tent-footprint.html

Outdoor Foundation. (2024). Sleeping pad R-values and ground insulation standards. Journal of Outdoor Recreation, 48(2), 77–93.

National Outdoor Leadership School. (2024). Campsite selection and ground layer techniques. NOLS Field Guide, 21(1), 33–49.

Wilderness Medicine Institute. (2024). Cold ground conduction and thermal protection during camping. Backcountry Safety Quarterly, 36(1), 88–104.