Artificial turf and fire: what a spec sheet’s fire test shows, and how close turf should go to the house

01Can artificial turf catch fire, or does it only melt?

Both, depending on the heat.

• Small heat melts it. Polyethylene, the plastic most turf blades are made of (AstroTurf), melts at about 239 to 275°F, by one turf maker’s patent filing. Wood doesn’t burn until about 451°F (NAHB). So heat that wouldn’t light a wood fence can still melt turf, and by SYNLawn’s care manual, a lit cigarette fuses its turf’s fiber tips without igniting it.
• A real fire can burn it. The Insurance Institute for Business & Home Safety (IBHS) defines combustible as “materials that can ignite and burn” and lists artificial turf among combustible groundcovers, with wood and rubber mulch (IBHS standard). The Colorado State Forest Service (CSFS) says some decks are readily combustible “whether made of synthetic (plastic/composite) or natural materials” (CSFS guide).
• Wind decides how far a fire goes. The Colorado Climate Center describes “moderate to high wind movement” on the plains, winter “dry air and strong winds,” and severe turbulent winds near the foothills, called chinooks when they warm (Climate of Colorado).

Everyday melting: fire pits and grills.

02What does “passed D2859” on a spec sheet mean?

That a small flame on a flat sample went out on its own, in a lab. One SYNLawn sheet prints flammability “Passed” under D-2859 and lists E108 and E648 with no result for either (SYNLawn).

D2859 is ASTM’s near-copy of the federal carpet test, 16 CFR 1630 (ASTM D2859). In the federal method, each of eight samples lies flat under a steel plate with an 8-inch hole, and a small methenamine tablet burns in the middle of the hole with the hood’s draft off. A sample passes if the char stops at least an inch short of the hole’s edge, so within about 3 inches of the tablet, and seven of eight must pass (16 CFR 1630).

A pass doesn’t show how turf behaves in wind or a bigger fire: ASTM says the method alone doesn’t assess fire hazard “under actual fire conditions,” and it specifies no underlay. It rates a product “flame-resistant under specific controlled laboratory conditions,” which is not noncombustible.

03Does the infill change how turf burns?

It changes what sits between the blades, not what the blades are made of.

• Silica sand doesn’t burn: CSFS and Larimer County’s code both list sand among the surfaces that belong right against a house. But it sits around plastic blades on a plastic backing, and IBHS counts artificial turf as combustible with no exception for infill.
• Crumb rubber is ground-up scrap tire (EPA). EPA says tires are difficult to ignite but, once burning, very hard to put out, with water often futile (EPA, on tire piles), and IBHS lists rubber mulch with turf among the groundcovers to clear from the first 5 feet. Few yards have it: the federal crumb rubber study says home turf doesn’t typically include it (EPA and CDC/ATSDR), and Firestone’s code prohibits it.
• Cork, coconut fiber and walnut shell infills are typically about 30 percent plant material and 70 percent sand by weight, and some need watering to hold their moisture (Gale Associates). Colorado’s low humidity “favors rapid evaporation,” and CSFS wants mulch and other organic debris out of the first 5 feet. Treat plant-based infill like mulch there.

More on choosing infill: infill types.

04How close to the house can turf go on a wildfire-prone lot?

At least 5 feet from the walls, with rock, gravel or pavers in that band.

Is the lot wildfire-prone? CSFS says a home in or near the natural vegetation of Colorado’s grasslands, shrublands, foothills or mountains is in the wildland-urban interface. In Northern Colorado that includes foothill lots west of Fort Collins, Loveland and Berthoud, and plains lots that back onto open grass. All 20 of Colorado’s largest wildfires have burned since 2002; the largest, the 2020 Cameron Peak Fire, burned 208,913 acres (Colorado Division of Fire Prevention and Control) after starting near Cameron Pass (Colorado Forest Restoration Institute).

Why 5 feet. CSFS says wind can carry embers more than a mile ahead of a fire, and embers are the most common way homes ignite in wildfires. Its Zone 1, the first 5 feet, calls for nonflammable, hard surfaces such as rock, gravel, sand, cement, bare earth or pavers, and Larimer County’s code tells its code official to refer to that guide. IBHS’s Wildfire Prepared Home standard, written for wind-driven embers, names artificial turf among the groundcovers to remove from those 5 feet, measured from the walls and from the outer posts of any combustible deck. IBHS calls clearing combustibles from that band the most effective defensible-space step a homeowner can take (IBHS), and its designation program is available in Colorado (Wildfire Prepared Home).

Decks and patios. The same standard lists artificial turf among the items to take off the walking surface of an attached deck or patio, and off the ground under an elevated deck.

From 5 to 30 feet. This is CSFS’s Zone 2, where turf for play, dogs or putting can go. CSFS notes that grass fuels “can readily ignite structures that are directly adjacent to them,” so the band matters with a real lawn too. How a large lot divides up: turf on an acreage lot.

05Do Larimer County, Fort Collins or Firestone have fire rules for turf?

Not legal advice; as read in September 2026. Under Colorado’s SB23-166, a state board adopts a minimum wildfire code, and each county or town with interface land and building- or fire-code power must adopt one that meets or exceeds it.

• Unincorporated Larimer County. The county’s 2025 Wildfire Resiliency Code, effective January 1, 2026, deems all of unincorporated Larimer County wildland-urban interface and requires “noncombustible, hard surface materials” such as rock, gravel, sand, concrete or pavers in the first 5 feet around a structure (building codes; amended code). It doesn’t name artificial turf and lets conditions legal at adoption continue, so it reaches mainly new building and big jobs such as replacing 25 percent or more of a home’s siding: ask Larimer County’s building office before turf goes against an existing house.
• Fort Collins. For building permit applications since April 1, 2026, in areas the state’s Wildfire Resiliency Code Map classes as low, moderate or high fire intensity, only noncombustible hard surfaces and ignition-resistant plantings from the city’s list may go in a 5-foot Immediate Zone around the structure (Ordinance No. 222, 2025). Artificial turf isn’t on that list. It depends on the map and the permit: ask Fort Collins Planning.
• Firestone. The town’s turf standard says “All materials shall be non-flammable,” names no test, and requires silica or acrylic-coated sand infill (Firestone Development Code 16.6.4). Whether a D2859 pass counts is the town’s call: ask Firestone Planning before you order.
• Loveland, Berthoud and other towns. Each town with interface land adopts its own code. It depends on the town: ask Loveland Planning or Berthoud Planning. Weld County’s version is in turf on an acreage lot.
• HOAs. Colorado law bars an HOA from prohibiting turf in a detached home’s backyard, but leaves it free to adopt bona fide safety requirements and to restrict changes that interfere with fire buffers or defensible space (C.R.S. 38-33.3-106.5, from SB23-178). See HOA approval.

06What fire paperwork should I ask for before buying turf?

For the exact product going in, ask for:

1. The fire test report, not only the word “Passed.” A good answer names the test (ASTM D2859 or 16 CFR 1630), the lab, the date and this product.
2. What was tested. A good answer says whether the sample was the turf alone or the turf with its infill.
3. A result for every fire test listed. An E648 result is a number; an E108 result comes from a roof-covering test and matters only over a roof or deck.
4. The infill’s safety data sheet, if it has one. Section 5 covers fire-fighting measures, including hazardous combustion products, and Section 9 lists flammability (OSHA).
5. In Firestone, what the town accepted as “non-flammable,” in writing from Firestone Planning.
6. Where the turf stops. On a wildfire-prone lot, a good answer puts the edge at least 5 feet from the walls and from any combustible deck’s posts, with rock, gravel or pavers between and an edge that holds (edging options).

Related: what a turf spec sheet should show, questions to ask a turf installer, is artificial turf toxic and artificial turf installation.