Columbia, MD · mostly separated · mixed

Grist Mill Trail

2.5 mi Out-and-back 266 ft gain

The Grist Mill Trail is a 5.0 mile long hiking and biking trail located in Patapsco Valley State Park in the Baltimore County side of the Patapsco Valley near Catonsville, Maryland. The paved pathway runs parallel to the Baltimore and Ohio Railroad to the north, and the Patapsco River to the south.

Live · updated Aug 11, 1:23 AM ET

Today's verdict

Thunderstorms in the forecast — lightning and cyclists are a bad combination.

Thunderstorms — lightning and cyclists do not mix — get off the road before they arrive.
Pavement: wet — wet during the likely ride window — reduced braking, road spray, limited visibility to drivers.
29 mph wind — strong — plan for slow outbound if wind is against you.
72°F air — right in road cycling's sweet spot

0 /100

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0 Road

0 E-bike

Best for road cycling today

Route map

Orange marker is the start. Click the map to enable scroll-zoom — the polyline is approximate; use Ride with GPS or Komoot for turn-by-turn.

Atmosphere

Air temp

72°F

Cloudy
Wind

29 mph

W
Rain

38%

Next 24h: 0.19"
Humidity

94%

Surface & daylight

Pavement

wet

mixed surface
Sunrise

6:16 AM
Sunset

8:08 PM

1126 min remaining

Best time today

2 AM looks best — 73°F · 6 mph W wind · mostly cloudy. 3 AM is a close second (25/100).

2 AM Best

73°

Mostly Cloudy

6 mph W

3 AM

73°

Mostly Cloudy

5 mph W

4 AM

73°

Mostly Cloudy

5 mph W

5 AM

73°

Mostly Cloudy

5 mph W

6 AM

73°

Partly Sunny

6 mph W

7 AM

73°

Partly Sunny

5 mph W

8 AM

74°

Partly Sunny

6 mph NW

9 AM

77°

Partly Sunny

7 mph NW

10 AM

81°

Partly Sunny

6 mph W

11 AM

83°

Partly Sunny

7 mph W

12 PM

85°

Mostly Sunny

8 mph W

1 PM

85°

Partly Sunny

7 mph W

2 PM

86°

Chance Showers And Thunderstorms

8 mph W

—

3 PM

86°

Chance Showers And Thunderstorms

8 mph W

—

4 PM

87°

Chance Showers And Thunderstorms

7 mph W

—

5 PM

86°

Showers And Thunderstorms Likely

7 mph W

—

6 PM

84°

Showers And Thunderstorms Likely

7 mph W

—

7 PM

83°

Chance Showers And Thunderstorms

5 mph W

—

Wind on this route

29 mph headwind outbound — expect a 29 mph headwind on the return.

Currently 29 mph from the W (260°). Relative to this ride's overall bearing, a quartering headwind.

Leg 1 Bearing 282° · headwind 0.2 mi
Leg 2 Bearing 286° · headwind 0.2 mi
Leg 3 Bearing 303° · quartering headwind 0.2 mi
Leg 4 Bearing 328° · quartering headwind 0.2 mi
Leg 5 Bearing 314° · quartering headwind 0.2 mi
Leg 6 Bearing 320° · quartering headwind 0.2 mi
Leg 7 Bearing 327° · quartering headwind 0.2 mi
Leg 8 Bearing 313° · quartering headwind 0.2 mi

Elevation profile

477 ft gain 408 ft loss Max 217' Min 46' 2.4 mi sampled

Score breakdown

72°F air Right in road cycling's sweet spot

+10

−

29 mph wind Strong — plan for slow outbound if wind is against you.

-18

−

Quartering headwind 29 mph headwind outbound — expect a 29 mph headwind on the return.

-4

−

Thunderstorms Lightning and cyclists do not mix — get off the road before they arrive.

-45

−

Pavement: wet Wet during the likely ride window — reduced braking, road spray, limited visibility to drivers.

-32

About this route

Distance: 2.5 mi one-way (double for round-trip)
Elevation gain: 266 ft
Surface: mixed
Shape: Out-and-back
Traffic exposure: mostly separated
Activities: road cycling · e bike
Cycle network: LCN · route GMT
Operator: Maryland Department of Natural Resources Maryland Park Service
Start: 39.2306, -76.7294
City hub: Columbia, MD
OSM: relation 12290215

Description sourced from the Wikipedia summary.