City Of Colorado Springs Municipal to Aspen-Pitkin County/Sardy Field COS → ASE
104 nautical miles (120 statute miles) west on a straight line, true course 285°, about 277° magnetic at the departure end (variation 8E). At 120 knots that is 53 min at the quickest height in today's winds (8,500 ft, a 3-knot headwind), arriving about 7:19 pm MDT (01:19 UTC), after sunset at the destination. Right now COS is VFR, wind from the south-southwest (210°) at 13 knots; ASE is VFR, wind from the north-northwest (330°) at 3 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: 23 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
- SIGMET W68W: thunderstorms (a convective SIGMET) up to 36,000 ft, moving from the southwest at 40 knots, until 7:55 pm MDT (01:55 UTC). Over the last 47 nm of the route.
as issued
WSUS33 KKCI 112355 MKCW WST 112355 CONVECTIVE SIGMET 68W VALID UNTIL 0155Z CO NM AZ UT FROM 30W CHE-20NNW TBE-60SE ABQ-40N SJN-30SW MTU-30W CHE AREA TS MOV FROM 23040KT. TOPS TO FL360.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the whole route.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the whole route.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 28 nm of the route.
- 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 last 9 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 E545 at 6,000 ft, 45 nm north, 3:49 pm MDT (21:49 UTC): remarks: low-level wind shear + 5 knots fap runway 17L. 19 nm along the route, 45 nm north of the line.
as filed, and in English
APA UUA /OV APA350002/TM 2149/FL060/TP E545/RM LLWS +/- 5 KT FAP RWY 17L
- Report
- an urgent report filed through APA
- Where
- 2 nm north (350°) of APA
- Time
- 21:49 UTC
- Height
- at 6,000 ft
- Aircraft
- E545
- Remarks
- low-level wind shear + 5 knots fap runway 17L
- GLF5 at 45,000 ft, 24 nm north, 4:44 pm MDT (22:44 UTC): moderate turbulence, remarks: ZDVWC-46. 9 nm along the route, 24 nm north of the line.
as filed, and in English
COS UA /OV COS350025/TM 2244/FL450/TP GLF5/TB MOD /RM ZDVWC-46
- Report
- a routine report filed through COS
- Where
- 25 nm north (350°) of COS
- Time
- 22:44 UTC
- Height
- at 45,000 ft
- Aircraft
- GLF5
- Turbulence
- moderate
- Remarks
- ZDVWC-46
- CRJ2 at 19,000 ft, 7 nm northwest, 4:02 pm MDT (22:02 UTC): moderate chop turbulence, remarks: during the climb from KDEN from 12,000 ft to 19,000 ft ZDVWC-41. 9 nm along the route, 7 nm northwest of the line.
as filed, and in English
COS UA /OV BRK262015/TM 2202/FL190/TP CRJ2/TB MOD CHOP/RM DURC FROM KDEN 120-190 ZDVWC-41
- Report
- a routine report filed through COS
- Where
- 15 nm west (262°) of BRK
- Time
- 22:02 UTC
- Height
- at 19,000 ft
- Aircraft
- CRJ2
- Turbulence
- moderate chop
- Remarks
- during the climb from KDEN from 12,000 ft to 19,000 ft ZDVWC-41
- C650 at 40,000 ft, 13 nm north, 5:48 pm MDT (23:48 UTC): moderate turbulence, remarks: ZDVWC-03. At the destination end, 13 nm north of the line.
as filed, and in English
ASE UA /OV DBL/TM 2348/FL400/TP C650/TB MOD /RM ZDVWC-03
- Report
- a routine report filed through ASE
- Where
- over DBL
- Time
- 23:48 UTC
- Height
- at 40,000 ft
- Aircraft
- C650
- Turbulence
- moderate
- Remarks
- ZDVWC-03
- C680A at 16,000 ft, 0 nm northeast, 4:59 pm MDT (22:59 UTC): moderate turbulence, scattered clouds above 16,000 ft, remarks: during the descent. At the destination end, 0 nm northeast of the line.
as filed, and in English
ASE UA /OV HAERI/TM 2259/FL160/TP C680A/SK SCT160/TB CONS MOD/RM DURD
- Report
- a routine report filed through ASE
- Where
- haeri
- Time
- 22:59 UTC
- Height
- at 16,000 ft
- Aircraft
- C680A
- Sky
- scattered clouds from 16,000 ft
- Turbulence
- continuous moderate
- Remarks
- during the descent
- C680 at 18,000 ft, 20 nm southwest, 4:35 pm MDT (22:35 UTC): moderate turbulence, remarks: from 18,000 ft to 10,000 ft. At the destination end, 20 nm southwest of the line.
as filed, and in English
ASE UA /OV ASE230020/TM 2235/FL180/TP C680/TB MOD/RM 180-100
- Report
- a routine report filed through ASE
- Where
- 20 nm southwest (230°) of ASE
- Time
- 22:35 UTC
- Height
- at 18,000 ft
- Aircraft
- C680
- Turbulence
- moderate
- Remarks
- from 18,000 ft to 10,000 ft
- C700 at 16,000 ft, 22 nm northeast, 3:55 pm MDT (21:55 UTC): moderate turbulence. At the destination end, 22 nm northeast of the line.
as filed, and in English
ASE UA /OV WERNR/TM 2155/FL160/TP C700/TB MOD
- Report
- a routine report filed through ASE
- Where
- wernr
- Time
- 21:55 UTC
- Height
- at 16,000 ft
- Aircraft
- C700
- Turbulence
- moderate
- LJ40 at 19,000 ft, 10 nm west, 3:32 pm MDT (21:32 UTC): moderate turbulence. At the destination end, 10 nm west of the line.
as filed, and in English
ASE UA /OV ASE240010/TM 2132/FL190/TP LJ40/TB MOD
- Report
- a routine report filed through ASE
- Where
- 10 nm southwest (240°) of ASE
- Time
- 21:32 UTC
- Height
- at 19,000 ft
- Aircraft
- LJ40
- Turbulence
- moderate
- B737 at 36,000 ft, 13 nm north, 3:28 pm MDT (21:28 UTC): moderate turbulence, remarks: zdvwc. At the destination end, 13 nm north of the line.
as filed, and in English
ASE UA /OV DBL/TM 2128/FL360/TP B737/TB MOD/RM ZDVWC
- Report
- a routine report filed through ASE
- Where
- over DBL
- Time
- 21:28 UTC
- Height
- at 36,000 ft
- Aircraft
- B737
- Turbulence
- moderate
- Remarks
- zdvwc
- B738 at 38,000 ft, 40 nm north, 4:39 pm MDT (22:39 UTC): light chop turbulence, remarks: light mountain wave a 8-knot loss of airspeed zdvwc. 76 nm along the route, 40 nm north of the line.
as filed, and in English
ASE UA /OV DBL047040/TM 2239/FL380/TP B738/TB LGT CHOP/RM LGT MTN WAVE +/-8KTS ZDVWC
- Report
- a routine report filed through ASE
- Where
- 40 nm northeast (047°) of DBL
- Time
- 22:39 UTC
- Height
- at 38,000 ft
- Aircraft
- B738
- Turbulence
- light chop
- Remarks
- light mountain wave a 8-knot loss of airspeed zdvwc
- B739 at 22,000 ft, 23 nm north, 3:53 pm MDT (21:53 UTC): light turbulence, remarks: ZDVWC-06. 76 nm along the route, 23 nm north of the line.
as filed, and in English
EGE UA /OV SXW090040/TM 2153/FL220/TP B739/TB CONS LGT/RM ZDVWC-06
- Report
- a routine report filed through EGE
- Where
- 40 nm east (090°) of SXW
- Time
- 21:53 UTC
- Height
- at 22,000 ft
- Aircraft
- B739
- Turbulence
- continuous light
- Remarks
- ZDVWC-06
- B38M at 32,000 ft, 49 nm northwest, 5:32 pm MDT (23:32 UTC): light turbulence, no icing, remarks: ZDVWC-04. At the destination end, 49 nm northwest of the line.
as filed, and in English
EEO UA /OV EKR146023/TM 2332/FL320/TP B38M/TB CONS LGT /IC NEG/RM ZDVWC-04
- Report
- a routine report filed through EEO
- Where
- 23 nm southeast (146°) of EKR
- Time
- 23:32 UTC
- Height
- at 32,000 ft
- Aircraft
- B38M
- Turbulence
- continuous light
- Icing
- none
- Remarks
- ZDVWC-04
- B38M at 32,000 ft, 33 nm north, 5:27 pm MDT (23:27 UTC): light chop turbulence, no icing, remarks: ZDVWC-03. At the destination end, 33 nm north of the line.
as filed, and in English
ASE UA /OV DBL359020/TM 2327/FL320/TP B38M/TB CONS LGT CHOP OCNL MOD CHOP/IC NEG/RM ZDVWC-03
- Report
- a routine report filed through ASE
- Where
- 20 nm north (359°) of DBL
- Time
- 23:27 UTC
- Height
- at 32,000 ft
- Aircraft
- B38M
- Turbulence
- continuous light chop occasional moderate chop
- Icing
- none
- Remarks
- ZDVWC-03
- C680A at 14,000 ft, 13 nm north, 5:02 pm MDT (23:02 UTC): light to moderate chop turbulence. At the destination end, 13 nm north of the line.
as filed, and in English
ASE UA /OV DBL/TM 2302/FL140/TP C680A/TB LGT OCNL MOD CHOP
- Report
- a routine report filed through ASE
- Where
- over DBL
- Time
- 23:02 UTC
- Height
- at 14,000 ft
- Aircraft
- C680A
- Turbulence
- light occasional moderate chop
4 more routine reports are on the map.
Winds aloft along the route, and the time en route the forecast for use 20:00–03:00 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 3 forecast points nearest it (PUB, DEN, GJT). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 8,500 ft | 200° at 28 kt | +3 kt | 16 °C | 117 kt | 53 min | 7:19 pm MDT (01:19 UTC) |
| 10,500 ft | 210° at 30 kt | +6 kt | 12 °C | 114 kt | 55 min | 7:21 pm MDT (01:21 UTC) |
| 12,500 ft | 210° at 32 kt | +10 kt | 6 °C | 110 kt | 57 min | 7:23 pm MDT (01:23 UTC) |
| 14,500 ft | 220° at 36 kt | +16 kt | 1 °C | 104 kt | 1 h | 7:26 pm MDT (01:26 UTC) |
| 16,500 ft | 230° at 40 kt | +22 kt | -4 °C | 98 kt | 1 h 04 min | 7:30 pm MDT (01:30 UTC) |
| 18,000 ft FL180 | 230° at 43 kt | +26 kt | -8 °C | 94 kt | 1 h 06 min | 7:32 pm MDT (01:32 UTC) |
| 24,000 ft FL240 | 230° at 46 kt | +28 kt | -21 °C | 92 kt | 1 h 08 min | 7:34 pm MDT (01:34 UTC) |
| 30,000 ft FL300 | 240° at 65 kt | +46 kt | -31 °C | 74 kt | 1 h 24 min | 7:50 pm MDT (01:50 UTC) |
| 34,000 ft FL340 | 240° at 67 kt | +51 kt | -36 °C | 69 kt | 1 h 30 min | 7:56 pm MDT (01:56 UTC) |
| 39,000 ft FL390 | 250° at 57 kt | +46 kt | -47 °C | 74 kt | 1 h 24 min | 7:50 pm MDT (01:50 UTC) |
Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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; 49 nm from the line | 210/24 16° | 210/28 8° | 230/43 -8° | 240/42 -21° | 240/77 -30° | 240/72 -36° | 250/51 -47° | ||
| DEN | used from 47 nm out; 84 nm from the line | 190/31 16° | 210/32 7° | 240/41 -8° | 230/47 -21° | 240/56 -32° | 250/65 -37° | 250/61 -47° | ||
| GJT | used from 95 nm out; 82 nm from the line | 210/40 11° | 210/46 3° | 210/61 -10° | 210/68 -22° | 220/57 -29° | 230/59 -36° | 240/66 -46° |
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: scattered clouds at 10,000 feet, a broken layer at 14,000 feet, a broken layer at 24,000 feet | from the south-southwest (210°) at 13 knots | 10+ mi | 14,000 ft | 6,187 ft | 5:54 pm MDT (23:54 UTC) |
| LXV Leadville, CO | 76 nm out, 7 nm north of the line | VFR Sky: scattered clouds at 8,000 feet, scattered clouds at 10,000 feet | from the south-southwest (210°) at 11 knots, gusting to 18 | 10+ mi | none | 9,933 ft | 23:53 UTC |
| ASE Aspen, CO | destination | VFR Sky: a few clouds at 9,500 feet | from the north-northwest (330°) at 3 knots | 10+ mi | none | 7,837 ft | 5:53 pm MDT (23:53 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 ASE when you get there the forecast at the estimated arrival, 7:19 pm MDT (01:19 UTC)
Wind from the south at 10 knots, gusting to 24, visibility 6 miles, mist, scattered clouds at 5,000 feet, a broken layer at 9,000 feet VFR
At times between Sun 6:00 pm MDT (00:00 UTC) and 8:00 pm MDT (02:00 UTC): wind variable at 20 knots, gusting to 35, visibility 4 miles, light rain showers, a broken layer at 5,000 feet marginal VFR
The whole forecast for ASE
- From Sun 6:00 pm MDT (00:00 UTC): wind from the south at 10 knots, gusting to 24, visibility 6 miles, mist, scattered clouds at 5,000 feet, a broken layer at 9,000 feet
- At times between Sun 6:00 pm MDT (00:00 UTC) and 8:00 pm MDT (02:00 UTC): wind variable at 20 knots, gusting to 35, visibility 4 miles, light rain showers, a broken layer at 5,000 feet
- From Sun 8:00 pm MDT (02:00 UTC): wind from the south-southeast at 11 knots, gusting to 26, visibility more than 6 miles, low-level wind shear, scattered clouds at 4,500 feet, a broken layer at 7,000 feet
- 30% chance between Sun 8:00 pm MDT (02:00 UTC) and 11:00 pm MDT (05:00 UTC): visibility 4 miles, light rain showers, a broken layer at 4,500 feet
- From Mon 12:00 am MDT (06:00 UTC): wind from the south-southeast at 10 knots, gusting to 21, visibility more than 6 miles, low-level wind shear, a few clouds at 5,000 feet, scattered clouds at 13,000 feet
- From Mon 5:00 am MDT (11:00 UTC): wind from the south at 6 knots, visibility more than 6 miles, a few clouds at 5,000 feet, scattered clouds at 12,000 feet
- From Mon 9:00 am MDT (15:00 UTC): wind from the south at 9 knots, visibility more than 6 miles, a few clouds at 4,500 feet, a few clouds at 20,000 feet
The forecast for COS, the departure
- From Sun 6:00 pm MDT (00:00 UTC): wind from the south-southwest at 20 knots, gusting to 32, visibility more than 6 miles, a few clouds at 10,000 feet, scattered clouds at 20,000 feet
- From Sun 9:00 pm MDT (03:00 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
Temporary flight restrictions on the line or within 25 nm of it
- 6/8770 COLORADO SPRINGS, CO, Saturday, October 10, 2026 through Monday, October 12, 2026 UTC 6 nm from the route, 19 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 12 October · ZDV
- 6/8784 LAKE GEORGE, CO, Sunday, October 11, 2026 through Tuesday, October 13, 2026 UTC 0 nm from the route, 38 nm along the route · a hazard on the ground (fire-fighting, a chemical spill, rescue work) · until 13 October · ZDV
Daylight
Sunset at COS 6:25 pm MDT (00:25 UTC), at ASE 6:33 pm MDT (00:33 UTC) (civil twilight ends 7:00 pm MDT (01:00 UTC)). At 120 knots the arrival at ASE is after sunset there (6:34 pm MDT (00:34 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, Aspen-Pitkin County/Sardy Field.