Backyard trampolines

What actually injures people on trampolines

Three mechanisms account for most of the harm, and they are not equally addressed by equipment.

Collisions between jumpers. When two or more people jump together, the mat transfers energy unpredictably. The lighter jumper takes the worst of it, because they are the one launched at the wrong moment from a surface that is already moving. This is the mechanism behind a large share of home trampoline fractures, and it is also the one no accessory fixes.

Falls off the equipment. Over the edge, onto the springs and frame, or clear onto the ground. This is the mechanism enclosures were designed for, and they work on it.

Somersaults, flips and failed landings. Low frequency, high severity. Landing on the head or neck from an incomplete rotation is the route to the injuries everyone is actually afraid of.

There is a fourth: falls onto the frame or springs while climbing on or off, which is why the ladder is a mixed blessing.

What an enclosure fixes, and what it does not

An enclosure is a net, a set of poles, and the attachment between the net and the jumping surface. Done well, it removes falls to the ground almost entirely.

What it does not do:

• Stop jumper-to-jumper collisions, which happen inside the net
• Stop bad landings on the mat
• Prevent somersault injuries
• Survive neglect, since a UV degraded net tears under exactly the load it exists to catch

The detail that separates a good enclosure from a decorative one is where the net attaches. A net that attaches to the mat inside the springs keeps jumpers away from the springs and frame entirely. A net mounted outside the springs leaves the frame and springs reachable, so a jumper can land on them before the net does anything. Pole padding, a full length zipper or an overlapping entry, and a net that is under tension rather than flapping are the other markers.

The AAP policy statement notes that safety measures like nets and padding have not appeared to mitigate the overall risk substantially¹, which is consistent with the collision mechanism sitting outside what a net can catch.

ASTM F2225 is the consumer trampoline enclosure standard³, and ASTM F381 covers the trampoline itself, including assembly, components, use and labeling². Neither is law. Both are what a careful manufacturer certifies to, and the absence of any standard reference on the box tells you something.

In-ground versus above-ground

Factor	Above-ground	In-ground
Typical installed cost	$400 to $3,000	$3,000 to $9,000
Fall from frame to ground	Up to about 3 ft	Near grade
Still needs an enclosure	Yes	Usually yes
Extra work	Anchoring against wind	Excavation, retaining wall, drainage, airflow

In-ground is not a shortcut to safety. It removes one mechanism, the fall from frame height, and leaves the other three untouched. It also introduces problems an above-ground unit does not have: a pit that fills with water without drainage, a mat that bottoms out without an airflow gap, and a retaining structure that has to hold back soil for a decade. If the reason for going in-ground is sightlines rather than safety, that is a legitimate reason, and permits, setbacks and HOA rules is the page to read first, because excavation is more likely to trigger review than a freestanding unit.

Springs, springless designs and net quality

Steel spring trampolines put a band of hard hardware between the mat and the frame. That band is what the pad covers, and the pad is the part that fails first.

Springless designs replace springs with fiberglass rods or elastic bands mounted below the jumping surface, which moves the hardware out of the landing zone. That is a genuine design improvement for one specific mechanism, landing on the springs. It does not change collision or somersault risk, and independent evidence comparing overall injury rates between the two designs is limited, so treat marketing claims about total safety with care. Expect to pay $1,200 to $3,500 for a springless unit in 2026 US pricing against $400 to $1,500 for a mainstream spring model with an enclosure.

Placement, clearance and what goes underneath

Trampolines need more space than people give them:

• Level ground. A frame on a slope loads unevenly and walks downhill.
• Overhead clearance clear of branches, wires and eaves. Manufacturers commonly specify about 24 feet from the ground, and low branches are the usual failure.
• Side clearance of at least 6 feet to fences, walls, sheds, poles and the house.
• Nothing hard underneath or alongside: no patio, no deck edge, no concrete path, no rock border.
• An anchor kit. Trampolines are large sails. They cross yards and hit cars in storms, and anchoring is a $25 to $60 fix.

Grass under a trampoline is not protective surfacing, and it will die anyway. The same logic that governs fall height and use zones applies here even though the trampoline standards are separate: what you fall onto decides how bad the landing is. Backyard surfacing covers the options, and the same page is worth reading if the trampoline is sharing a tight yard with a playset. If space is genuinely short, small yards is the honest conversation about what fits.

The rules that reduce injuries most

In order of how much difference they make:

1. One jumper at a time. This is the single most effective household rule, because it removes the largest injury mechanism outright.
2. No somersaults or flips. These carry the head and neck risk.
3. No children under 6 on a full size trampoline, which is what the CPSC safety alert advises and what most manuals repeat⁴.
4. Adult in sight, not adult in the house. Supervision only works if the adult can intervene before the second child climbs on. The same principle runs through playground supervision.
5. Remove or lock the ladder when not in use, so a three year old cannot start a session alone.
6. No jumping onto or off the trampoline, and nothing on the mat that is not a person.

These rules only hold if the adults enforce them on day 400, not day 4. That is the realistic problem with trampolines: the rules are simple and the compliance curve falls off. Weigh that honestly against how your household actually runs.

Maintenance and the UV clock

Sun, not use, sets the replacement schedule. Check monthly during the season:

• Net for thinning, holes, split seams and failed zip attachments
• Pad for cracks, exposed foam and missing ties
• Mat stitching where it meets the V-rings, and any stretched or missing springs
• Frame welds and legs for rust, especially where legs meet grass
• Anchors still tight after storms

Plan on a net and pad replacement every 2 to 5 years, at $80 to $250 and $100 to $350 respectively, 2026 US pricing. This fits naturally into the same routine as annual playset maintenance, and in cold climates the winter decisions in winterizing a playset apply to the net and pad too: take the soft parts off, leave the frame anchored.

What pediatric bodies say, and what to do anyway

The American Academy of Pediatrics strongly discourages home use of trampolines. Where families use one anyway, its policy statement calls for constant adult supervision, a single jumper at a time, no somersaults, adequate protective padding in good condition, and regular inspection of the equipment¹. That is a clear position and it deserves to be stated plainly rather than softened.

Plenty of families buy one regardless, and the useful question then is how to run it well. If you have decided:

Trampolines sit in the same territory as other high-arousal play: genuinely valuable, genuinely risky, and best managed by removing the worst mechanisms rather than banning the activity. Risky play covers how that trade is usually framed, and playground injury causes shows what the same analysis looks like for fixed equipment.