how to know sleeping bag warm enough

[raumsch]

Does anyone have a tip, I am planning a hike from 1000 to 1500 meters which has not decided yet in next Spring. Got a Timberbrother down sleeping bag, Tcomf + 5 ° C, Tlim 0 ° C. How do I know this sleeping bag will keep warm enough at the lowest temperatures plan to hike in? Is there any way to test it out? 

[ppine]

You can test it in the backyard at a known temperature. Use the same pad and shelter you would use on a trip. 

[ppine]

Some people think they need a new sleeping bag, when in fact they only need a warmer pad.