---
title: "When Did Japan Attack Oahu? The Complete Timeline"
canonical: "https://hawaiitravelbureau.com/when-did-japan-attack-the-island-of-oahu/"
author: "Evan Miles"
published: "2026-10-20T03:00:00+00:00"
modified: "2026-10-01T10:13:13+00:00"
language: "en-US"
site: "Hawaii Travel Bureau"
description: "If you are researching when did japan attack the island of oahu, the Imperial Japanese Navy launched its surprise offensive on the morning of Sunday…"
categories: "Hawaii Travel Guides"
attribution: "Hawaii Travel Bureau (https://hawaiitravelbureau.com/)"
---

# When Did Japan Attack Oahu? The Complete Timeline

If you are researching when did japan attack the island of oahu, the Imperial Japanese Navy launched its surprise offensive on the morning of Sunday, December 7, 1941. Most historical summaries focus exclusively on Pearl Harbor. The actual military operation struck military bases, airfields, and naval assets across the entire island.

 

Official logs from the [Naval History and Heritage Command](https://www.history.navy.mil) record the initial airfield bomb drops at 7:48 AM Hawaiian Standard Time. The assault killed 2,403 Americans and damaged or sank 19 naval vessels within two hours. Understanding the exact sequence reveals how coordinated this multi-target strike really was across Oahu.

 

![when did japan attack the island of oahu](https://hawaiitravelbureau.com/wp-content/uploads/2026/10/when-did-japan-attack-the-island-of-oahu-mupd063g.webp)

 

Image source: Web (Bing) / ibiblio.org (Web image (fair-use with source credit))

 

## Quick Answer

 

Japan attacked the island of Oahu on Sunday, December 7, 1941. The opening strikes hit naval air stations at 7:48 AM local time. Torpedo bombers targeted Battleship Row seven minutes later at 7:55 AM.

 

The coordinated assault ended around 9:45 AM that morning. Over two thousand four hundred American service members and civilians died.

 

## The Exact Date and Timeline of the Oahu Attack

 

The attack occurred on December 7, 1941, in Hawaii, but time zone differences created different calendar dates around the globe. In Washington, D.C., officials received word of the attack early Sunday afternoon. In Tokyo, the local date was already Monday, December 8, 1941.

 

The Imperial Japanese Navy strike force, known as the *Kidō Butai*, positioned six aircraft carriers roughly 230 miles north of Oahu before dawn. From that staging area, Vice Admiral Chūichi Nagumo launched 353 combat planes in two successive waves. The entire aerial assault lasted one hour and 57 minutes from the first bomb drop to the final departure.

 

| Location | Local Date | Time of First Strike |
| --- | --- | --- |
| Oahu (Hawaiian Standard Time) | Sunday, Dec 7, 1941 | 7:48 AM HST |
| Washington, D.C. (Eastern Standard Time) | Sunday, Dec 7, 1941 | 1:18 PM EST |
| Tokyo (Japan Standard Time) | Monday, Dec 8, 1941 | 3:18 AM JST |

 

The operational timeline was built around Sunday morning routines. Japanese planners knew American guard shifts changed early on Sunday. Many anti-aircraft batteries lacked ready ammunition, and personnel were either off-duty or preparing for morning services.

 

## Why the Entire Island of Oahu Was Targeted Beyond Pearl Harbor

 

Popular retellings treat Pearl Harbor as the sole target, but Japanese battle doctrine demanded total control of Oahu airspace. Had the Japanese focused only on the fleet anchorage, American fighter squadrons could have scrambled to intercept the bombers. Neutralizing every major runway on Oahu was the essential first priority of the mission.

 

![Wheeler Field](https://hawaiitravelbureau.com/wp-content/uploads/2026/10/wheeler-field-mupd076g.webp)

 

Image source: Web (Bing) / pasadenastarnews.com (Web image (fair-use with source credit))

 

Japanese dive bombers and fighters fanned out across Oahu to strike five key military installations at the same time:

 

- **Wheeler Field:** Located in central Oahu, this was the primary U.S. Army Air Corps fighter base. Japanese planes strafed rows of Curtiss P-40 Warhawks before pilots could reach their cockpits.
- **Hickam Field:** Situated adjacent to Pearl Harbor, Hickam housed heavy bombers like the B-17 Flying Fortress. Destroying these bombers eliminated long-range American reconnaissance capabilities.
- **Kaneohe Naval Air Station:** Located on the windward coast of Oahu, Kaneohe housed long-range PBY Catalina flying boats. These patrol planes were bombed directly on their ramps and moorings.
- **Ewa Marine Corps Air Station:** Marine fighter and scout squadrons were caught on the ground and systematically disabled.
- **Bellows Field:** A secondary fighter airfield on the eastern coast, hit to suppress any remaining interceptor activity.

 

By destroying American aircraft on the ground, the strike force protected its own bombers over the fleet. American pilots managed to get only a handful of fighters airborne during the entire raid.

 

## Minute-by-Minute Chronology: The First and Second Attack Waves

 

The assault was executed in two coordinated waves, each carrying distinct tactical assignments.

 

### The First Strike Wave: Airfields and Battleship Row (7:48 AM to 8:30 AM HST)

 

The first wave carried 183 aircraft divided into three operational groups. At 7:48 AM, dive bombers hit Kaneohe Naval Air Station and Wheeler Field. Japanese flight commander Mitsuo Fuchida radioed the famous signal *Tora!

 

Tora! Tora!* at 7:53 AM, confirming that complete tactical surprise had been achieved.

 

At 7:55 AM, Nakajima B5N "Kate" torpedo bombers descended low over the waters of Pearl Harbor. They dropped modified Type 91 torpedoes fitted with wooden fins to operate in the shallow 40-foot harbor depth.

 

The forward magazine of the USS *Arizona* detonated at approximately 8:06 AM after taking a direct hit from a modified armor-piercing naval shell. The explosion lifted the 31,000-ton battleship out of the water, killing 1,177 crew members instantly. Nearby, the USS *Oklahoma* took multiple torpedo strikes and rolled completely over within twelve minutes.

 

### The Second Strike Wave: Mopping Up and Target Dispersion (8:54 AM to 9:45 AM HST)

 

The second wave arrived over Oahu at 8:54 AM with 167 aircraft. By this point, heavy black smoke covered the harbor, making torpedo attacks impractical. This wave relied primarily on Aichi D3A "Val" dive bombers and high-altitude horizontal bombers.

 

The second wave concentrated on secondary naval targets, repair drydocks, and remaining airfield hangars. The battleship USS *Nevada* managed to get underway at 8:40 AM to escape the harbor trap. Japanese dive bombers quickly swarmed the moving vessel, forcing her crew to beach the ship at Hospital Point to avoid blocking the harbor channel.

 

By 9:45 AM, the last Japanese aircraft turned north toward their carriers. A proposed third wave targeting the naval fuel depots and machine repair shops was canceled by Admiral Nagumo, who chose to preserve his fleet and withdraw.

 

## Measured Toll: Aircraft, Naval Vessels, and Casualty Data

 

The human and material toll of the attack devastated American Pacific defenses. Archival records from the [National Park Service](https://www.nps.gov) maintain the definitive accounting of the destruction.

 

| Category | American Losses | Japanese Losses |
| --- | --- | --- |
| Personnel Killed | 2,403 (2,008 Navy, 218 Army, 109 Marines, 68 Civilians) | 64 |
| Personnel Wounded | 1,178 | Unknown |
| Battleships Damaged / Sunk | 8 (USS Arizona and USS Oklahoma total losses) | 0 |
| Other Vessels Sunk / Damaged | 11 (cruisers, destroyers, auxiliaries) | 5 midget submarines |
| Aircraft Destroyed | 188 | 29 |
| Aircraft Damaged | 159 | 74 |

 

The loss of life was heavily concentrated on Battleship Row, but civilian casualties occurred across Honolulu as well. Errant American anti-aircraft shells that failed to detonate in mid-air fell back into residential neighborhoods, igniting fires and causing civilian casualties.

 

## Critical Warning Signs and Defense Missteps Before the Assault

 

The attack succeeded largely due to communication delays and misinterpreted intelligence signals in the hours before the strike.

 

![Opana Radar Station](https://hawaiitravelbureau.com/wp-content/uploads/2026/10/opana-radar-station-mupd07oj.webp)

 

Image source: Web (Bing) / tripadvisor.com (Web image (fair-use with source credit))

 

Several critical events could have alerted Oahu defenses:

 

1. **The Submarine Sighting (3:42 AM to 6:45 AM):** The minesweeper USS *Condor* spotted a periscope near the harbor entrance at 3:42 AM. Hours later, at 6:45 AM, the destroyer USS *Ward* fired upon and sank a Japanese midget submarine attempting to follow a supply vessel inside. The report worked its way up the command chain too slowly to sound a general alarm.
2. **The Opana Point Radar Echo (7:02 AM):** Operators at the SCR-270 radar station at Opana Point tracked a massive flight of aircraft approaching from the north at 7:02 AM. An inexperienced watch officer at the intercept center dismissed the blip, believing it was a scheduled flight of American B-17 bombers arriving from California.
3. **Defensive Aircraft Clustering:** Lieutenant General Walter Short feared local sabotage more than aerial bombardment. He ordered all Army aircraft parked tightly together in the open center of airfields rather than dispersed in protective revetments. This decision made the aircraft easy targets for Japanese strafing runs.

 

As of 2026, modern military analysis continues to study these operational breakdowns as a foundational case study in warning intelligence and command communication.

 

## Immediate Aftermath and the Strategic Shift in the Pacific

 

The attack on Oahu permanently changed naval doctrine and global geopolitics within 24 hours. President Franklin D. Roosevelt delivered his "Day of Infamy" speech to a joint session of Congress the following day, December 8, 1941.

 

The United States formally declared war on Japan that afternoon, ending years of strict domestic isolationism.

 

Strategically, the assault crippled the Pacific Fleet's battle line but failed to achieve Japan's primary objective. The U.S. Navy's three Pacific aircraft carriers (USS *Enterprise*, USS *Lexington*, and USS *Saratoga*) were out at sea on delivery and patrol missions.

 

The missed carriers forced the United States to rebuild its naval strategy around carrier strike groups and submarine warfare rather than traditional battleship engagements.

 

Crucially, the Japanese strike force left Oahu's critical infrastructure untouched:

 

- **Submarine Base:** The intact submarine pens allowed American subs to begin offensive patrols across the Pacific immediately.
- **Fuel Storage Facilities:** Millions of barrels of above-ground oil reserves survived without a scratch. Losing that fuel would have forced the entire Pacific Fleet to retreat to California.
- **Drydocks and Repair Shops:** Naval engineers refloated and repaired six of the eight damaged battleships, returning them to active combat service before the end of the war.

 

## Frequently Asked Questions About the Attack on Oahu

 

### What time of day did the attack on Oahu start?

 

The attack began precisely at 7:48 AM Hawaiian Standard Time on Sunday, December 7, 1941. The first bombs struck Kaneohe Naval Air Station and Wheeler Field. Torpedo planes initiated their runs against Battleship Row seven minutes later at 7:55 AM.

 

### Were any American aircraft carriers destroyed during the attack?

 

No American aircraft carriers were present at Pearl Harbor or damaged during the attack. The USS *Enterprise* was returning from Wake Island, the USS *Lexington* was delivering aircraft to Midway Island, and the USS *Saratoga* was undergoing maintenance in San Diego.

 

### How many Japanese planes attacked Oahu?

 

A total of 353 Japanese aircraft attacked Oahu across two distinct operational waves. The first wave carried 183 planes, while the second wave launched 167 planes. An additional 29 planes conducted combat air patrols to protect the carrier fleet north of the island.

 

### Why were Army planes parked closely together on Oahu airfields?

 

Lieutenant General Walter Short ordered aircraft parked tightly in airfield centers to protect them against ground sabotage. Military commanders feared local sabotage from Hawaii's large Japanese-American population more than an aerial raid. This clustering left the aircraft completely defenseless against strafing and fragmentation bombs.

 

### Which battleships were permanently lost at Pearl Harbor?

 

Only two of the eight battleships were total losses: the USS *Arizona* (BB-39) and the USS *Oklahoma* (BB-37). The USS *Utah*, an older vessel serving as an anti-aircraft training ship, also sank permanently. Navy salvage crews successfully raised and rebuilt the remaining battleships.