A gas grill that heats more slowly on a cold day is not necessarily broken. But weak flames, repeated flameouts, a gas smell, or a burner that will not light deserve a different response from an ordinary longer preheat. Start with the symptom, then check whether the problem affects the whole grill or one burner.
This guide focuses on equipment checks for cold-weather grilling. For seasoning, browning, and serving food while it is still hot, see how to maintain barbecue flavor in cold weather.
Stop troubleshooting if you suspect a gas leak
A gas odor or the sound of escaping gas is not a normal winter inconvenience. Do not press the igniter or try to find the leak with a flame. Move everyone away, avoid creating sparks, and call 911 or the fire department from a safe location. Close the supply valve only if safe; never approach a cylinder surrounded by flames or a vapor cloud. Do not return or use the grill until a qualified professional says it is safe. See the Propane Education & Research Council's portable-cylinder safety guide.
Use the grill outdoors, with the ventilation and clearances required by its manual. A garage with the door open is not a substitute. If you cannot safely stand near and supervise the grill because of wind, ice, or severe weather, postpone grilling. A temperature app does not replace attendance.
Match the symptom before changing anything
| What you notice | What it may point to | First useful check |
|---|---|---|
| All burners look normal, but preheating takes longer | Weather-related heat loss or a temperature-reading issue | Check the permitted preheat procedure, wind exposure, and whether the reading rises steadily. |
| Every burner has a small flame | Fuel supply or restricted gas flow | After shutdown, check fuel availability, hose condition, and the model's low-heat instructions. |
| Only one burner is weak or will not light | A local ignition, burner, or connection problem | Let the grill cool and inspect that burner's serviceable parts as directed. |
| The igniter makes no clicking sound | Battery or ignition connection, on models that use them | With gas off, check the specified battery type, orientation, and accessible connections. |
| Flames go out in gusts | Unsafe wind exposure or another operating fault | Shut down; do not repeatedly relight in the same conditions. |
| Persistent yellow flames, soot, or unusual burning | A combustion or burner problem | Stop cooking and arrange the manual's inspection or support process. |
This table narrows the investigation; it does not establish a diagnosis. Record what happened before taking parts apart. A problem that began immediately after a cylinder change is a different starting point from one that developed after months in storage.
My grill takes longer to preheat
Compare like with like: the same burner settings, a similar food load, and the same thermometer. Cold air and wind can change the settings and time needed to reach your cooking temperature. A lid thermometer also measures conditions at its location, not the temperature inside your steak.
- Start with the correct procedure. Find your model in Monument's manual library. Follow its lighting, preheating, and lid-position instructions. Do not leave the grill on high indefinitely to chase a number.
- Look for a trend. Is the indicated temperature continuing to rise, or has it stalled while all flames remain unusually small? The second pattern calls for the low-heat checks below.
- Check the measurement. A damaged gauge can mislead you. If you have a suitable grill-temperature probe, install it only as its instructions allow; do not expect two sensors in different locations to read identically.
- Keep the cooking plan flexible. Wait until the grill is ready for the recipe. Do not add a fixed number of minutes per pound simply because it is winter.
If the grill no longer performs as it normally does and the cause is unclear, stop and ask support. “It is cold outside” should not become the explanation for every change.
All the flames are low, even on a higher setting
Do not immediately buy a different regulator. Low fuel, a restricted hose, a gas-flow safety device, and a component fault can produce similar symptoms. The approved regulator and hose are part of the grill's fuel system, not a winter performance upgrade.
With the controls and gas supply off and the grill cool, check the following:
- Fuel: confirm that the propane cylinder is not empty using a method approved for the cylinder or your grill's supported fuel indicator. Do not assume the amount of frost tells you how much fuel remains.
- Hose: look for a kink, abrasion, cracking, or contact with a hot surface. Do not operate with a damaged hose.
- Recent changes: note whether the issue followed a cylinder replacement, reconnection, or unusual startup sequence.
- Model instructions: use only the regulator-reset procedure specified for your grill. If it requires reconnection, complete the required leak test before relighting. See the gas leak test guide for the testing boundary.
Do not bypass a safety device, fit a higher-pressure regulator, or repeatedly disconnect parts to force gas flow. If the approved procedure does not restore normal operation, contact support. Natural-gas owners should not follow propane-cylinder reset advice; have a qualified professional check unresolved supply problems.
The igniter clicks, but a burner will not light
Clicking tells you that part of the ignition system is operating; it does not prove that the spark is correctly positioned or that gas is reaching the burner. Stop an unsuccessful lighting attempt at the limit in your manual, switch the controls off, and follow its open-lid waiting instructions before any permitted retry. Never keep releasing gas while repeatedly pressing the igniter.
After cooling, check whether the problem is confined to one burner. Inspect accessible ignition connections and clean only the components the manual identifies as owner-serviceable. After storage, burner tubes may also need inspection for debris or insect nests. Do not enlarge gas orifices or improvise ignition adjustments.
For a silent battery-powered igniter, check the specified battery and polarity with gas off. If one burner remains unreliable after approved maintenance, leave the grill out of service and request help. The general grill troubleshooting guide covers problems that continue beyond winter weather.
Wind keeps disrupting the flame, or frost appears
For wind: stop if flames repeatedly blow out or become unstable. Do not move a lit or hot grill. Before the next use, choose a permitted outdoor position that is less exposed while preserving every required clearance. Do not add panels, seals, blankets, or foil over ventilation openings to hold heat in.
For frost or ice: do not diagnose the fuel system from appearance alone. If frost accompanies weak flames or abnormal operation, shut down and contact support or your propane supplier. Never warm a cylinder with a heater, flame, hot water, or another external heat source. Keep cylinders upright outdoors in a ventilated location, away from ignition sources; follow the PERC cylinder and winter-weather guidance.
Set up a more predictable next cook
- Clear snow and ice before lighting, and make sure you can reach the controls safely.
- Remove the storage cover completely. Replace it only after shutdown and full cooling.
- Check fuel, the hose, burner condition, and grease buildup before the meal is underway.
- Prepare tools and a clean serving tray so the cook can remain with the grill.
- Use a food thermometer for doneness; use a timer as a reminder, not proof that food is cooked.
If you need Monument support, provide the model and serial number, fuel type, which burners are affected, when the problem began, and the checks already completed. Add photos only when safe to take. That information is more useful than repeatedly attempting the same startup.
Join the conversation
Share Your Thoughts
Have a question, a variation, or a result worth sharing? Add it to the conversation.