McHenry County

Region · Illinois

McHenry County

Best timeMay–Oct
From you
Nearest airportORD · 34 mi
On this page

Overview

McHenry County is in Northern Illinois in the United States.

Updated from Wikivoyage on 1 October 2026 · Something wrong or missing? Improve it on Wikivoyage

Plan your trip

Best time to visit & weather

Most comfortable: May–Oct. Summer highs reach about 85°F; winter lows dip to about 20°F. Cold months (Jan, Feb, Dec) can bring snow and ice; check road conditions. Wettest: May and Jun. (climate data from nearby Chicago)

Jan: 2.3 in rain2.3"Jan: high 33°F, low 20°F33°20°JanFeb: 2.1 in rain2.1"Feb: high 37°F, low 23°F37°23°FebMar: 2.7 in rain2.7"Mar: high 48°F, low 32°F48°32°MarApr: 4.2 in rain4.2"Apr: high 60°F, low 42°F60°42°AprMay: 4.8 in rain4.8"May: high 72°F, low 52°F72°52°MayJun: 4.5 in rain4.5"Jun: high 81°F, low 63°F81°63°JunJul: 4.0 in rain4"Jul: high 85°F, low 68°F85°68°JulAug: 4.1 in rain4.1"Aug: high 83°F, low 67°F83°67°AugSep: 3.3 in rain3.3"Sep: high 76°F, low 59°F76°59°SepOct: 3.9 in rain3.9"Oct: high 64°F, low 47°F64°47°OctNov: 2.7 in rain2.7"Nov: high 50°F, low 35°F50°35°NovDec: 2.3 in rain2.3"Dec: high 38°F, low 25°F38°25°Dec

Blue bars: average daily high and low (°F). Purple columns: average monthly rain and melted snow (inches).

Getting there

  • From you: to see whether to drive or fly, and how long it takes.
  • ORD Chicago O'Hare International Airport, Chicago — 34 mi away (major hub). Directions
  • RFD Chicago Rockford International Airport, Chicago/Rockford — 36 mi away. Directions

McHenry County is most accessible using I-90 from either Chicago or Rockford. However, many other arterial routes cross the area including US 14 (passes through most major communities in the county), US 12 (passes immediately to the east of the county and then through Richmond) and US 20 (passes to the south and then through Marengo). A number of state routes also crisscross the county.

Full “Get in” guide ↓

Budget & where to stay

No prices are listed for this place yet. See the Sleep guide ↓ for options.

Sample 3-day trip

  1. Day 1: Crystal Lake — Colonel Palmer House, Illinois Railway Museum, Main Beach.
  2. Day 2: Woodstock — The Woodstock Opera House.
  3. Day 3: Harvard — Statue of Harmilda the Cow, Harvard Milk Days.

Built from the best-covered destinations in this region; open each for its own day plan.

Places in McHenry County

Understand

McHenry County is a formally mostly rural county which may be considered part of both the Chicagoland and greater Northern Illinois region. With the expansion of I-90 and daily commuter service to Chicago, many parts of the county (specifically the southeastern and southern portions) became increasingly developed and are now considered suburbs of Chicago. However, many portions of the county (particularly the western and northern regions) are still largely rural. The modern day county is a mixture of old and new but remains largely politically conservative. It continues to be one of the fastest growing areas of the region.

Regions

McHenry is unique in that its development and geography make classifying it in one particular region or another exceptionally difficult. The southeastern portions, which are heavily developed, might be said to properly belong with the greater Chicagoland region, while the western and northern areas gravitate toward other region centers. In general, McHenry County can be divided to belong to the following regions:

  • Chicagoland's Northwestern Suburbs: Algonquin, Crystal Lake, Cary, Huntley and Lake in the Hills share many characteristics with Chicagoland's other northwestern suburbs and may be properly assigned there.
  • Chicagoland's Chain O'Lakes: The extreme northeastern portion of the County, including Spring Grove and Richmond, share many economic characteristics with the rest of the Chain O'Lakes communities.
  • Northern Illinois's Kishwaukee Valley: Woodstock, Marengo, Harvard and Hebron tend to be culturally and economically related to the Rockford area and may be assigned to the Kishwaukee River Valley. The northern branch of the river rises near Woodstock.

Cities

  • Algonquin, a large, suburban community located mostly in McHenry County with a small portion in Kane County. Located directly on the Fox River and home to the large outdoor shopping area called Algonquin Commons.
  • Cary, a small, suburban community in the southeastern portion of the County.
  • Crystal Lake, a suburban community located in the southeastern portion of the County. It is known for its downtown.
  • Harvard, a rural community in the northwestern portion of the County. Known for its annual Milk Days celebration.
  • Hebron, a rural community in the northern part of the County. Known regionally for its painted water tower which commemorates a high basketball State Championship.
  • Huntley, a relatively new suburban community located on I-90 and partially located in Kane County.
  • Lake in the Hills, a suburban community located near I-90.
  • Richmond, a rural community in the northeastern portion of the County. It sits along US 12 and is immediately adjacent to Genoa City.
  • Spring Grove, a suburban community located in the northeastern portion of the County along US 12.
  • Woodstock, the county seat and known for its opera house and historic downtown.

Other destinations

McHenry County has an exceptionally diverse environment, and the McHenry County Conservation District manages over 25,000 acres of preserved land with plenty of opportunities for hiking, camping and more. Some of the preserved parks in McHenry County include the following:

  • Pleasant Valley Conversation Area: An open area featuring a mixture of landscapes with extensive hiking trails.

Get in

McHenry County is most accessible using I-90 from either Chicago or Rockford. However, many other arterial routes cross the area including US 14 (passes through most major communities in the county), US 12 (passes immediately to the east of the county and then through Richmond) and US 20 (passes to the south and then through Marengo). A number of state routes also crisscross the county.

Metra, the greater Chicagoland passenger rail system, offers daily service to and from Chicago's Ogilvie Station on the Union Pacific Northwest Line via a number of communities in the County including Harvard, Woodstock, McHenry, Crystal Lake, Pingree Road (second Crystal Lake stop) and Cary. Service may terminate in Crystal Lake, McHenry or Harvard depending on the train.

Stay safe

By and large, McHenry County is safe.

Nearby

My experience

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