Valley County, MT Cell Phone Coverage Map & Network Rankings (2026)

Find the best cell phone network and plan to use in Valley County, MT

Coverage rankings for Valley County, MT

T-Mobile currently ranks first for coverage in this area, with a coverage score of 41.5. Compare Wireless Carriers uses FCC broadband map data to estimate and calculate coverage scores. More on that further below.

RankCarrierScoreOverall4G LTE5GFast 5GAverage Signal
1T-Mobile41.539.3%39.3%30.4%20.2% -96 dBm
2AT&T32.354.1%54.1%0.0%0.0% -108 dBm
3Verizon18.59.6%0.0%9.6%5.5% -95 dBm

Scores include coverage area, network type, and average signal strength.

Cell phone coverage map for Valley County, MT

Zoom in for local detail. Tap or click a colored area to see coverage and signal details. On mobile, use two fingers to move the map.

Coverage Key
Less covered More covered
Darker areas mean the carrier covers more of that location.

Map data © OpenStreetMap contributors, © CARTO. Rendered with MapLibre. FCC BDC mobile coverage processed by Compare Wireless Carriers.

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Cell phone coverage by network in Valley County, MT

#1

T-Mobile

Coverage Score 41.5
In Valley County, MT
Overall
39.3%
4G LTE
39.3%
5G
30.4%
Fast 5G
20.2%
Average Signal -96 dBm
#2

AT&T

Coverage Score 32.3
In Valley County, MT
Overall
54.1%
4G LTE
54.1%
5G
0.0%
Fast 5G
0.0%
Average Signal -108 dBm
#3

Verizon

Coverage Score 18.5
In Valley County, MT
Overall
9.6%
4G LTE
0.0%
5G
9.6%
Fast 5G
5.5%
Average Signal -95 dBm
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Coverage by city in Valley County, MT

Cities and towns are shown for county-level comparison. Coverage percentages use land-area only coverage.

CityVerizonAT&TT-Mobile
Fort Peck, MT 100.0% 0.0% 100.0% 100.0% -67 dBm 100.0% 100.0% 0.0% 0.0% -105 dBm 100.0% 100.0% 100.0% 69.6% -93 dBm
Frazer, MT N/A N/A N/A N/A N/A 100.0% 100.0% 0.0% 0.0% -99 dBm 100.0% 100.0% 100.0% 97.6% -83 dBm
Glasgow, MT 100.0% 0.0% 100.0% 88.2% -82 dBm 100.0% 100.0% 0.0% 0.0% -97 dBm 100.0% 100.0% 100.0% 100.0% -72 dBm
Glentana, MT N/A N/A N/A N/A N/A 84.9% 84.9% 0.0% 0.0% -104 dBm N/A N/A N/A N/A N/A
Hinsdale, MT 62.7% 0.0% 62.7% 0.7% -103 dBm 100.0% 100.0% 0.0% 0.0% -103 dBm 100.0% 100.0% 100.0% 100.0% -82 dBm
Larslan, MT 0.1% 0.0% 0.1% 0.0% -100 dBm 90.3% 90.3% 0.0% 0.0% -106 dBm 38.4% 38.4% 14.8% 5.2% -103 dBm
Nashua, MT N/A N/A N/A N/A N/A 100.0% 100.0% 0.0% 0.0% -91 dBm 100.0% 100.0% 100.0% 76.5% -94 dBm
Opheim, MT N/A N/A N/A N/A N/A 100.0% 100.0% 0.0% 0.0% -102 dBm N/A N/A N/A N/A N/A
Richland, MT N/A N/A N/A N/A N/A 70.5% 70.5% 0.0% 0.0% -113 dBm 8.9% 8.9% 2.3% 0.7% -106 dBm
Saint Marie, MT 0.2% 0.0% 0.2% 0.0% -110 dBm 88.6% 88.6% 0.0% 0.0% -115 dBm 69.4% 69.4% 66.7% 57.9% -81 dBm

About The Coverage Data

Coverage and signal estimates are derived by Compare Wireless Carriers from carrier-reported data in the FCC’s National Broadband Coverage Map, last updated in June 2025. “Percent covered” shows how much of the city or ZIP code area has a carrier signal, whether weak or strong. Signal bars show the estimated average signal strength in areas of Valley County, MT where that carrier has coverage.

If a carrier says you should have service but you do not, run a challenge test with the FCC Mobile Speed Test App. The FCC uses those results to check carrier-submitted coverage data and requires a carrier response when enough tests show a pattern of inaccurate coverage reporting.