City Of Colorado Springs Municipal to Boise Air Trml/Gowen Field COS → BOI
593 nautical miles (683 statute miles) northwest on a straight line, true course 302°, about 294° magnetic at the departure end (variation 8E). At 120 knots that is 4 h 59 min at the quickest height in today's winds (24,000 ft, a 1-knot headwind), arriving about 6:03 am MDT (12:03 UTC), after sunset at the destination. Right now COS is VFR, wind from the west-southwest (240°) at 7 knots; BOI is VFR, wind from the west-northwest (290°) at 10 knots. For planning, not a briefing: the legal preflight briefing comes from Flight Service (1-800-WX-BRIEF) or the FAA's own tools. Airlines fly this pair: 5 flights in the DOT's last twelve reported months, the route's page.
The route the straight line, the warnings crossed, restrictions, pilot reports and the airports along the way · click a mark for its words
Green, blue, red and purple airport dots are the flying conditions reported there now (VFR, marginal VFR, IFR, low IFR); grey means no report. Red areas are SIGMETs, orange areas AIRMETs, hatched red areas temporary flight restrictions. Map tiles: OpenFreeMap, data © OpenStreetMap contributors.
Warnings the route crosses SIGMETs and AIRMETs whose area the line passes through or comes within 25 nm of
- AIRMET TANGO 1W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the first 237 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 38,000 ft. Over the first 316 nm of the route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the first 297 nm of the route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 138 to 544 nm out.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 198 to 237 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 208 to 563 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 109 nm of the route.
A SIGMET warns of weather hazardous to all aircraft; an AIRMET of weather that matters to small aircraft and to flying without instruments. "From 60 to 180 nm out" is measured along the route from COS.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- urgent E75L at 9,000 ft, 32 nm southwest, 10:30 pm MDT (04:30 UTC): remarks: low-level wind shear + 20K 1000-1500 above ground on approach. 99 nm along the route, 32 nm southwest of the line.
as filed, and in English
ASE UUA /OV ASE/TM 0430/FL090/TP E75L/RM LLWS +/- 20K 1000-1500 AGL ON APCH
- Report
- an urgent report filed through ASE
- Where
- over ASE
- Time
- 04:30 UTC
- Height
- at 9,000 ft
- Aircraft
- E75L
- Remarks
- low-level wind shear + 20K 1000-1500 above ground on approach
- A321 at 31,000 ft, 9 nm north, 12:41 am MDT (06:41 UTC): moderate turbulence, remarks: mtw +/-15KT zdvwc. At the departure end, 9 nm north of the line.
as filed, and in English
COS UA /OV BRK/TM 0641/FL310/TP A321/TB MOD/RM MTW +/-15KT. ZDVWC
- Report
- a routine report filed through COS
- Where
- over BRK
- Time
- 06:41 UTC
- Height
- at 31,000 ft
- Aircraft
- A321
- Turbulence
- moderate
- Remarks
- mtw +/-15KT zdvwc
- E170 at 22,500 ft, 5 nm southwest, 11:06 pm MDT (05:06 UTC): light to moderate turbulence up to 23,000 ft, remarks: during the descent tbarr star ZDVWC-13. 40 nm along the route, 5 nm southwest of the line.
as filed, and in English
DEN UA /OV DEN216057/TM 0506/FL225/TP E170/TB CONS LGT OCNL MOD BLO 230/RM DURD TBARR STAR. ZDVWC-13
- Report
- a routine report filed through DEN
- Where
- 57 nm southwest (216°) of DEN
- Time
- 05:06 UTC
- Height
- at 22,500 ft
- Aircraft
- E170
- Turbulence
- continuous light occasional moderate below 23,000 ft
- Remarks
- during the descent tbarr star ZDVWC-13
- CRJ2 at 22,000 ft, 6 nm south, 12:35 am MDT (06:35 UTC): no turbulence up to 26,000 ft, no icing, clear from 22,000 ft to 60,000 ft, remarks: during the descent ZDVWC-26. 49 nm along the route, 6 nm south of the line.
as filed, and in English
DEN UA /OV DEN220060/TM 0635/FL220/TP CRJ2/SK SKC/TB NEG BLO 260/IC NEG/RM DURD/ ZDVWC-26
- Report
- a routine report filed through DEN
- Where
- 60 nm southwest (220°) of DEN
- Time
- 06:35 UTC
- Height
- at 22,000 ft
- Aircraft
- CRJ2
- Sky
- clear
- Turbulence
- no below 26,000 ft
- Icing
- none
- Remarks
- during the descent ZDVWC-26
- B738 at 23,000 ft, 3 nm south, 12:23 am MDT (06:23 UTC): no turbulence from 23,000 ft to 26,000 ft, clear from 23,000 ft to 60,000 ft, remarks: during the descent sskii star ZDVWC-06. 59 nm along the route, 3 nm south of the line.
as filed, and in English
DEN UA /OV DEN230060/TM 0623/FL230/TP B738/SK SKC/TB NEG 230-260/RM DURD SSKII STAR. ZDVWC-06
- Report
- a routine report filed through DEN
- Where
- 60 nm southwest (230°) of DEN
- Time
- 06:23 UTC
- Height
- at 23,000 ft
- Aircraft
- B738
- Sky
- clear
- Turbulence
- no from 23,000 ft to 26,000 ft
- Remarks
- during the descent sskii star ZDVWC-06
- A20N at 25,000 ft, 21 nm north, 12:19 am MDT (06:19 UTC): light chop turbulence up to 26,000 ft, remarks: during the climb ZDVWC-06. 59 nm along the route, 21 nm north of the line.
as filed, and in English
DEN UA /OV DEN250045/TM 0619/FL250/TP A20N/TB OCNL LGT CHOP BLO 260/RM DURC. ZDVWC-06
- Report
- a routine report filed through DEN
- Where
- 45 nm west (250°) of DEN
- Time
- 06:19 UTC
- Height
- at 25,000 ft
- Aircraft
- A20N
- Turbulence
- occasional light chop below 26,000 ft
- Remarks
- during the climb ZDVWC-06
- E175 at 6,300 ft, 33 nm northeast, 10:20 pm MDT (04:20 UTC): overcast above 6,300 ft, remarks: during the descent runway 31. 514 nm along the route, 33 nm northeast of the line.
as filed, and in English
SUN UA /OV KSUN/TM 0420/FL063/TP E175/SK OVC063-TOPUNKN/RM DURD RY31
- Report
- a routine report filed through SUN
- Where
- over KSUN
- Time
- 04:20 UTC
- Height
- at 6,300 ft
- Aircraft
- E175
- Sky
- overcast from 6,300 ft, tops unknown
- Remarks
- during the descent runway 31
Winds aloft along the route, and the time en route the forecast for use 02:00–09:00 UTC · at 120 knots true airspeed
The westbound cruising heights for this course (VFR: even thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 7 forecast points nearest it (PUB, DEN, GJT, RKS, SLC, PIH, BOI). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 4,500 ft | 260° at 3 kt | +2 kt | 2 °C | 118 kt | 5 h 02 min | 6:06 am MDT (12:06 UTC) |
| 6,500 ft | 250° at 4 kt | +3 kt | 1 °C | 117 kt | 5 h 04 min | 6:08 am MDT (12:08 UTC) |
| 8,500 ft | 220° at 21 kt | +2 kt | 6 °C | 118 kt | 5 h 02 min | 6:06 am MDT (12:06 UTC) |
| 10,500 ft | 220° at 25 kt | +6 kt | 1 °C | 114 kt | 5 h 12 min | 6:16 am MDT (12:16 UTC) |
| 12,500 ft | 230° at 30 kt | +9 kt | -2 °C | 111 kt | 5 h 21 min | 6:25 am MDT (12:25 UTC) |
| 14,500 ft | 220° at 36 kt | +7 kt | -6 °C | 113 kt | 5 h 15 min | 6:19 am MDT (12:19 UTC) |
| 16,500 ft | 220° at 41 kt | +6 kt | -10 °C | 114 kt | 5 h 12 min | 6:16 am MDT (12:16 UTC) |
| 18,000 ft FL180 | 210° at 45 kt | +5 kt | -13 °C | 115 kt | 5 h 09 min | 6:13 am MDT (12:13 UTC) |
| 24,000 ft FL240 | 210° at 58 kt | +1 kt | -24 °C | 119 kt | 4 h 59 min | 6:03 am MDT (12:03 UTC) |
| 30,000 ft FL300 | 220° at 61 kt | +9 kt | -29 °C | 111 kt | 5 h 21 min | 6:25 am MDT (12:25 UTC) |
| 34,000 ft FL340 | 220° at 64 kt | +17 kt | -34 °C | 103 kt | 5 h 45 min | 6:49 am MDT (12:49 UTC) |
| 39,000 ft FL390 | 220° at 58 kt | +16 kt | -43 °C | 104 kt | 5 h 42 min | 6:46 am MDT (12:46 UTC) |
Based on data from the 12th at 00:00 UTC; valid on the 12th at 06:00 UTC for use 02:00 to 09:00 UTC; temperatures above 24,000 ft are below zero. Heights are above sea level; a height is left out when the forecast has no wind for it over most of the line (the ground is higher). Ground speed is the airspeed less the headwind; the time en route is for the straight line and ignores climb, descent and routing around weather.
The forecast points as issued
| Point | From | 3,000 | 6,000 | 9,000 | 12,000 | 18,000 | 24,000 | 30,000 | 34,000 | 39,000 |
|---|---|---|---|---|---|---|---|---|---|---|
| PUB | used from 0 nm out; 54 nm from the line | 230/25 13° | 230/32 6° | 220/44 -8° | 230/49 -21° | 240/70 -28° | 240/67 -34° | 240/58 -46° | ||
| DEN | used from 49 nm out; 68 nm from the line | 240/21 14° | 250/44 6° | 220/49 -8° | 220/49 -21° | 230/54 -30° | 240/57 -35° | 240/49 -45° | ||
| GJT | used from 99 nm out; 86 nm from the line | 210/43 7° | 230/45 1° | 220/49 -12° | 220/62 -22° | 220/59 -28° | 230/60 -33° | 220/55 -45° | ||
| RKS | used from 198 nm out; 53 nm from the line | 200/41 | 220/44 1° | 220/35 -11° | 220/46 -24° | 210/53 -27° | 220/62 -35° | 230/61 -44° | ||
| SLC | used from 297 nm out; 72 nm from the line | 200/5 | 230/8 2° | 220/20 -2° | 210/40 -12° | 190/53 -25° | 210/62 -30° | 220/69 -34° | 220/64 -43° | |
| PIH | used from 395 nm out; 37 nm from the line | L/V | 240/13 1° | 240/15 -3° | 210/42 -15° | 200/70 -25° | 220/74 -29° | 220/71 -36° | 220/62 -43° | |
| BOI | used from 494 nm out; 74 nm from the line | 300/7 2° | 280/5 -4° | 210/16 -9° | 210/60 -20° | 210/75 -29° | 210/63 -32° | 220/64 -32° | 220/54 -39° |
The weather now: both ends and the airports along the way public airports with a weather report within 25 nm of the line, one for each stretch
| Airport | Where | Conditions | Wind | Visibility | Ceiling | Elevation | Reported |
|---|---|---|---|---|---|---|---|
| COS Colorado Springs, CO | departure | VFR Sky: a few clouds at 14,000 feet, a few clouds at 20,000 feet | from the west-southwest (240°) at 7 knots | 10+ mi | none | 6,187 ft | 12:54 am MDT (06:54 UTC) |
| LXV Leadville, CO | 79 nm out, 19 nm southwest of the line | VFR Sky: a broken layer at 9,000 feet | from the south (180°) at 13 knots, gusting to 20 | 10+ mi | 9,000 ft | 9,933 ft | 06:53 UTC |
| EGE Eagle, CO | 119 nm out, 12 nm south of the line, tower | VFR Sky: scattered clouds at 8,500 feet | from the east-southeast (110°) at 7 knots | 10+ mi | none | 6,547 ft | 06:56 UTC |
| FBR Fort Bridger, WY | 306 nm out, 2 nm southeast of the line | VFR Sky: scattered clouds at 6,000 feet, a broken layer at 7,000 feet, overcast at 8,500 feet | from the west (270°) at 9 knots | 10+ mi | 7,000 ft | 7,038 ft | 06:55 UTC |
| MLD Malad City, ID | 405 nm out, 4 nm east of the line | no report just now | 4,503 ft | ||||
| BYI Burley, ID | 474 nm out, 10 nm south of the line | VFR Sky: overcast at 3,900 feet Weather: light rain | from the west (280°) at 9 knots, gusting to 19 | 10+ mi | 3,900 ft | 4,153 ft | 06:53 UTC |
| GNG Gooding, ID | 514 nm out, 9 nm southwest of the line | VFR Sky: overcast at 4,100 feet | calm | 10+ mi | 4,100 ft | 3,732 ft | 06:55 UTC |
| BOI Boise, ID | destination | VFR Sky: overcast at 9,000 feet | from the west-northwest (290°) at 10 knots | 10+ mi | 9,000 ft | 2,871 ft | 12:53 am MDT (06:53 UTC) |
The highest airport on this list sits at 9,933 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At BOI when you get there the forecast at the estimated arrival, 6:03 am MDT (12:03 UTC)
Wind from the west-northwest at 5 knots, visibility more than 6 miles, scattered clouds at 4,000 feet, a broken layer at 8,000 feet VFR
The whole forecast for BOI
- From Mon 12:00 am MDT (06:00 UTC): wind light and variable, visibility more than 6 miles, a broken layer at 8,000 feet
- From Mon 2:00 am MDT (08:00 UTC): wind from the west-northwest at 5 knots, visibility more than 6 miles, scattered clouds at 4,000 feet, a broken layer at 8,000 feet
- From Mon 12:00 pm MDT (18:00 UTC): wind from the northwest at 10 knots, visibility more than 6 miles, a broken layer at 10,000 feet
The forecast for COS, the departure
- From Mon 12:00 am MDT (06:00 UTC): wind from the south at 12 knots, visibility more than 6 miles, scattered clouds at 6,000 feet, a broken layer at 20,000 feet
- From Mon 6:00 am MDT (12:00 UTC): wind from the north-northeast at 8 knots, visibility more than 6 miles, clear skies
- From Mon 11:00 am MDT (17:00 UTC): wind from the south at 15 knots, gusting to 25, visibility more than 6 miles, scattered clouds at 12,000 feet
- From Mon 1:00 pm MDT (19:00 UTC): wind from the south-southwest at 20 knots, gusting to 30, visibility more than 6 miles, scattered clouds at 12,000 feet
- From Mon 7:00 pm MDT (01:00 UTC): wind from the south-southwest at 12 knots, visibility more than 6 miles, clear skies
Temporary flight restrictions on the line or within 25 nm of it
- 6/8784 LAKE GEORGE, CO, Sunday, October 11, 2026 through Tuesday, October 13, 2026 UTC 8 nm from the route, 30 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 13 October · ZDV
Daylight
Sunset at COS 6:23 pm MDT (00:23 UTC), at BOI 7:05 pm MDT (01:05 UTC) (civil twilight ends 7:33 pm MDT (01:33 UTC)). At 120 knots the arrival at BOI is before sunrise there (7:55 am MDT (13:55 UTC)).
Each restriction opens the FAA's own page with the exact area, heights and times. Ordinary notices to air missions (closed runways, lights out) are not shown: the FAA's notice search is not open to sites like this one at this time.
Radar and forecast charts for the regions crossed government pictures, the latest each time the page loads
Sources: the Aviation Weather Center's data service (SIGMETs, AIRMETs, graphical AIRMETs, pilot reports, winds and temperatures aloft, observations and terminal forecasts), the National Weather Service radar, the Weather Prediction Center's charts, the FAA's temporary flight restriction list and shapes, and the FAA's airport file for the positions, elevations and magnetic variation. Fetched when the page is viewed and kept a few minutes. Each leg is the straight line between its two airports; airways, terrain and airspace are not considered. The airports in detail: City Of Colorado Springs Municipal, Boise Air Trml/Gowen Field.