PelletDeckUgly truth
Cold-weather burn
The set point on the controller is the box temperature, not the work the fire is doing. In January the fire is also heating the air that keeps leaking out.
Short answer
In our model a pellet grill burns about 25% more pellets per hour in cool weather (about 40 to 59 F), 55% more in cold weather (about 25 to 39 F), and 2.1x the mild rate below freezing. Cook time stays the same, so the whole cook costs that much more fuel and a full hopper runs out that much sooner. These are planning multipliers in the calculator, not measurements of your patio.
- Block the wind. Traeger says to put the grill out of direct wind and that cold weather can mean more pellets and slower ignition (maker guidance, Traeger Support, Weather Effects on Grilling). Wind is not in our math. It only makes the numbers worse.
- Use an insulated blanket, within its limits. Traeger says a blanket helps reduce pellet use in cold climates, but only below 32 F and with the grill at 350 F or lower. Above that it can damage the grill and blanket, and in some cases start a fire (maker guidance, Traeger Support, Insulation Blankets). We do not model how much a blanket saves.
- Keep the lid shut and the pellets dry. Every peek lets cold air in that the fire has to heat again. Traeger also says to keep pellets fresh and dry and to cook to temperature, not time (Traeger Support, Weather Effects on Grilling).
Burn rate and hours to an empty hopper, by weather
Model output for listed grills at 225 and 275 F, in each weather setting the calculator has. Each cell is the burn rate, then how long a full hopper lasts at that rate after the 0.35 lb startup pad. Burn seeds are our estimates, not maker claims.
| Grill (model) | Set point | Mild (about 60 to 80 F) | Cool (about 40 to 59 F) | Cold (about 25 to 39 F) | Winter / sub-freezing |
|---|---|---|---|---|---|
| Traeger Pro 575 (18 lb) | 225 F | 0.90 lb/hr, 19 hr 37 min | 1.13 lb/hr, 15 hr 41 min | 1.40 lb/hr, 12 hr 39 min | 1.89 lb/hr, 9 hr 20 min |
| Traeger Pro 575 (18 lb) | 275 F | 1.15 lb/hr, 15 hr 25 min | 1.43 lb/hr, 12 hr 20 min | 1.77 lb/hr, 9 hr 57 min | 2.40 lb/hr, 7 hr 20 min |
| Traeger Ironwood 650 (20 lb) | 225 F | 0.80 lb/hr, 24 hr 34 min | 1.00 lb/hr, 19 hr 39 min | 1.24 lb/hr, 15 hr 51 min | 1.68 lb/hr, 11 hr 42 min |
| Traeger Ironwood 650 (20 lb) | 275 F | 1.02 lb/hr, 19 hr 18 min | 1.27 lb/hr, 15 hr 27 min | 1.58 lb/hr, 12 hr 27 min | 2.14 lb/hr, 9 hr 12 min |
| Pit Boss Sportsman 820 (21 lb) | 225 F | 1.00 lb/hr, 20 hr 39 min | 1.25 lb/hr, 16 hr 31 min | 1.55 lb/hr, 13 hr 19 min | 2.10 lb/hr, 9 hr 50 min |
| Pit Boss Sportsman 820 (21 lb) | 275 F | 1.27 lb/hr, 16 hr 14 min | 1.59 lb/hr, 12 hr 59 min | 1.97 lb/hr, 10 hr 28 min | 2.67 lb/hr, 7 hr 44 min |
| Recteq RT-590 Stampede (30 lb) | 225 F | 0.70 lb/hr, 42 hr 21 min | 0.88 lb/hr, 33 hr 53 min | 1.08 lb/hr, 27 hr 20 min | 1.47 lb/hr, 20 hr 10 min |
| Recteq RT-590 Stampede (30 lb) | 275 F | 0.89 lb/hr, 33 hr 18 min | 1.11 lb/hr, 26 hr 38 min | 1.38 lb/hr, 21 hr 29 min | 1.87 lb/hr, 15 hr 51 min |
| Camp Chef Woodwind Pro 24 (22 lb) | 225 F | 0.85 lb/hr, 25 hr 28 min | 1.06 lb/hr, 20 hr 23 min | 1.32 lb/hr, 16 hr 26 min | 1.78 lb/hr, 12 hr 8 min |
| Camp Chef Woodwind Pro 24 (22 lb) | 275 F | 1.08 lb/hr, 20 hr 1 min | 1.35 lb/hr, 16 hr 1 min | 1.68 lb/hr, 12 hr 55 min | 2.27 lb/hr, 9 hr 32 min |
| Z Grills 700D4E WiFi (28 lb) | 225 F | 0.80 lb/hr, 34 hr 34 min | 1.00 lb/hr, 27 hr 39 min | 1.24 lb/hr, 22 hr 18 min | 1.68 lb/hr, 16 hr 27 min |
| Z Grills 700D4E WiFi (28 lb) | 275 F | 1.02 lb/hr, 27 hr 10 min | 1.27 lb/hr, 21 hr 44 min | 1.58 lb/hr, 17 hr 32 min | 2.14 lb/hr, 12 hr 56 min |
If the winter column is shorter than your cook, you need a refill or a bigger hopper. The empty hopper overnight guide covers planning that refill before bed.
Worked example: the same brisket in May and January
A 12 lb packer brisket at 225 F on a Traeger Pro 575 (18 lb hopper, 0.9 lb/hr at 225 F in our estimate). Every number is calculator output, labeled model. Open it in mild weather or winter.
| Model | Mild | Winter |
|---|---|---|
| Cook time | 16 hr 30 min | 16 hr 30 min |
| Burn rate | 0.90 lb/hr | 1.89 lb/hr |
| Pellets burned | 15.2 lb | 31.5 lb |
| Share of the 18 lb hopper | 84% | 175% |
| Full hopper runs | 19 hr 37 min | 9 hr 20 min |
| Refills | None | 1, first about 9 hr 20 min in |
| 20 lb bags to buy | 1 | 2 |
Same meat, same clock. In mild weather the hopper covers it with about 2.8 lb left. In winter the cook wants 31.5 lb, the hopper runs dry about 7 hr 10 min before the brisket is done, and you need 2 bags instead of 1. How many pounds of pellets does the same bag math for other cuts.
Why the hopper dies at 2 a.m. in January
People post a 12 lb brisket at 225 F and wonder why a hopper that lasted all night in May died at 2 a.m. in January. The meat did not change. The gap between the pit and the air did.
Thin-wall grills feel this first. A leaky lid, a warped gasket, or a wind corridor along the fence will add another multiplier the controller cannot see. Wet pellets make it worse because some of the fire's work is boiling water you already paid for. That is also why soaking pellets on purpose is a bad idea.
Poultry shows the effect fast because the cook is short and hot. A 20 lb turkey at 325 F burns about 6.9 lb on a Pro 575 in mild weather and about 14.0 lb with the winter toggle on. The numbers are on turkey on a pellet grill.
Ops notes that are not magic
Keep a full hopper and a spare bag next to the grill, not in the garage after you go to bed.
A blanket made for your grill can help in the cold. A random tarp that melts or blocks the exhaust can hurt. Stay inside the maker's temperature limits.
Read the formula page if you want the exact exponents. Read pellets per hour for the burn-rate chart behind these totals.