diff --git a/.gitignore b/.gitignore
index 52d5b6df9..9e784d263 100644
--- a/.gitignore
+++ b/.gitignore
@@ -149,3 +149,6 @@ cython_debug/
 
 # Ignore dotenv/direnv files
 .env*
+
+# Ignore notebooks
+*.ipynb
diff --git a/pyproject.toml b/pyproject.toml
index 4e45dcd7b..5903f8503 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ dependencies = [
   "pydantic>=2.10.2,<3",
   "annotated-types>=0.7.0,<0.8",
   "polyfactory>=2.18.1,<3",
+  "exchange-calendars>=4.8",
 ]
 description = "ThetaGang is an IBKR bot for getting money"
 license = "AGPL-3.0-only"
diff --git a/thetagang.toml b/thetagang.toml
index f7a8b8f4d..394ea7de6 100644
--- a/thetagang.toml
+++ b/thetagang.toml
@@ -616,3 +616,41 @@ sell_threshold = 10000
       # ["noTakeLiq", "1"],
     ]
     strategy = "Vwap"
+
+[exchange_hours]
+# ThetaGang can check whether the market is open before running. This is useful
+# to avoid placing orders when the market is closed. We can also (for example)
+# avoid running too early (i.e., immediately after market open) to avoid the
+# initial volatility, or too late (i.e., immediately before market close) to
+# avoid the closing volatility.
+
+# The exchange to check for market hours. XNYS is the NYSE, but you can use any
+# of the ISO exchange codes from
+# https://github.com/gerrymanoim/exchange_calendars?tab=readme-ov-file#Calendars.
+#
+# For example, you'd use "XTKS" for the Tokyo Stock Exchange, "XLON" for the
+# London Stock Exchange, or "XHKG" for the Hong Kong Stock Exchange.
+exchange = "XNYS"
+
+# If the market is closed, we can either exit immediately, wait until it's
+# time to begin, or continue as normal. Specify "exit" to exit, "wait" to wait,
+# and "continue" to continue.
+#
+# Setting this to "continue" is equivalent to disabling this feature.
+action_when_closed = "exit"
+
+# The maximum amount of time, in seconds, to wait for the market to open if you
+# set `exchange_hours.action_when_closed = "wait"`. For example, a value of 3600
+# means ThetaGang will only wait for the market to open if it's within 1 hour of
+# the current time.
+max_wait_until_open = 3600
+
+# The amount of time, in seconds, after the market open, to wait before running
+# ThetaGang. For example, if this is set to 1800, ThetaGang will consider the
+# market closed until 30 minutes after the open.
+delay_after_open = 1800
+
+# The amount of time, in seconds, before the market close, to stop running
+# ThetaGang. For example, if set to 1800, ThetaGang will consider the market
+# closed 30 minutes prior to the actual close.
+delay_before_close = 1800
diff --git a/thetagang/config.py b/thetagang/config.py
index e86a343e4..16ad109db 100644
--- a/thetagang/config.py
+++ b/thetagang/config.py
@@ -1,4 +1,5 @@
 import math
+from enum import Enum
 from typing import Any, Dict, List, Literal, Optional, Tuple
 
 from pydantic import BaseModel, Field, model_validator
@@ -469,11 +470,34 @@ class Puts(BaseModel):
     no_trading: Optional[bool] = None
 
 
+class ActionWhenClosedEnum(str, Enum):
+    wait = "wait"
+    exit = "exit"
+    continue_ = "continue"
+
+
+class ExchangeHoursConfig(BaseModel, DisplayMixin):
+    exchange: str = Field(default="XNYS")
+    action_when_closed: ActionWhenClosedEnum = Field(default=ActionWhenClosedEnum.exit)
+    delay_after_open: int = Field(default=1800, ge=0)
+    delay_before_close: int = Field(default=1800, ge=0)
+    max_wait_until_open: int = Field(default=3600, ge=0)
+
+    def add_to_table(self, table: Table, section: str = "") -> None:
+        table.add_row("[spring_green1]Exchange hours")
+        table.add_row("", "Exchange", "=", self.exchange)
+        table.add_row("", "Action when closed", "=", self.action_when_closed)
+        table.add_row("", "Delay after open", "=", f"{self.delay_after_open}s")
+        table.add_row("", "Delay before close", "=", f"{self.delay_before_close}s")
+        table.add_row("", "Max wait until open", "=", f"{self.max_wait_until_open}s")
+
+
 class Config(BaseModel, DisplayMixin):
     account: AccountConfig
     option_chains: OptionChainsConfig
     roll_when: RollWhenConfig
     target: TargetConfig
+    exchange_hours: ExchangeHoursConfig = Field(default_factory=ExchangeHoursConfig)
 
     orders: OrdersConfig = Field(default_factory=OrdersConfig)
     ib_async: IBAsyncConfig = Field(default_factory=IBAsyncConfig)
@@ -636,6 +660,7 @@ def display(self, config_path: str) -> None:
 
         # Add all component tables
         self.account.add_to_table(config_table)
+        self.exchange_hours.add_to_table(config_table)
         if self.constants:
             self.constants.add_to_table(config_table)
         self.orders.add_to_table(config_table)
diff --git a/thetagang/exchange_hours.py b/thetagang/exchange_hours.py
new file mode 100644
index 000000000..4f0042ffd
--- /dev/null
+++ b/thetagang/exchange_hours.py
@@ -0,0 +1,77 @@
+import time
+from datetime import datetime, timezone
+
+import exchange_calendars as xcals
+import pandas as pd
+
+from thetagang import log
+from thetagang.config import ExchangeHoursConfig
+
+
+def determine_action(config: ExchangeHoursConfig, now: datetime) -> str:
+    if config.action_when_closed == "continue":
+        return "continue"
+
+    calendar = xcals.get_calendar(config.exchange)
+    today = now.date()
+
+    if calendar.is_session(today):  # type: ignore
+        open = calendar.session_open(today)  # type: ignore
+        close = calendar.session_close(today)  # type: ignore
+
+        start = open + pd.Timedelta(seconds=config.delay_after_open)
+        end = close - pd.Timedelta(seconds=config.delay_before_close)
+
+        log.info(f"Exchange hours open={open}, close={close}, start={start}, end={end}")
+
+        if start <= now <= end:
+            # Exchange is open
+            return "continue"
+        elif config.action_when_closed == "exit":
+            log.info("Exchange is closed")
+            return "exit"
+        elif config.action_when_closed == "wait":
+            log.info("Exchange is closed")
+            return "wait"
+    elif config.action_when_closed == "wait":
+        return "wait"
+
+    log.info("Exchange is closed")
+    return "exit"
+
+
+def waited_for_open(config: ExchangeHoursConfig, now: datetime) -> bool:
+    calendar = xcals.get_calendar(config.exchange)
+    today = now.date()
+
+    next_session = calendar.date_to_session(today, direction="next")  # type: ignore
+
+    open = calendar.session_open(next_session)  # type: ignore
+    start = open + pd.Timedelta(seconds=config.delay_after_open)
+
+    seconds_until_start = (start - now).total_seconds()
+
+    if seconds_until_start < config.max_wait_until_open:
+        log.info(
+            f"Waiting for exchange to open, start={start} seconds_until_start={seconds_until_start}"
+        )
+        time.sleep(seconds_until_start)
+        return True
+    else:
+        log.info(
+            f"Max wait time exceeded, exiting (seconds_until_start={seconds_until_start}, max_wait_until_open={config.max_wait_until_open})"
+        )
+
+    return False
+
+
+def need_to_exit(config: ExchangeHoursConfig) -> bool:
+    now = datetime.now(tz=timezone.utc)
+    action = determine_action(config, now)
+    if action == "exit":
+        return True
+    if action == "wait":
+        return not waited_for_open(config, now)
+
+    # action is "continue"
+    return False
diff --git a/thetagang/test_exchange_hours.py b/thetagang/test_exchange_hours.py
new file mode 100644
index 000000000..394459751
--- /dev/null
+++ b/thetagang/test_exchange_hours.py
@@ -0,0 +1,104 @@
+from datetime import datetime, timezone
+from unittest.mock import patch
+
+from thetagang.config import ActionWhenClosedEnum, ExchangeHoursConfig
+from thetagang.exchange_hours import determine_action, waited_for_open
+
+
+def test_determine_action_continue_when_closed():
+    config = ExchangeHoursConfig(
+        exchange="XNYS",
+        delay_after_open=0,
+        delay_before_close=0,
+        action_when_closed=ActionWhenClosedEnum.continue_,
+    )
+    now = datetime(2025, 1, 21, 12, 0, tzinfo=timezone.utc)
+
+    result = determine_action(config, now)
+    assert result == "continue"
+
+
+def test_determine_action_in_open_window():
+    config = ExchangeHoursConfig(
+        exchange="XNYS",
+        delay_after_open=60,
+        delay_before_close=60,
+        action_when_closed=ActionWhenClosedEnum.continue_,
+    )
+    now = datetime(2025, 1, 21, 15, 0, tzinfo=timezone.utc)
+
+    result = determine_action(config, now)
+    assert result == "continue"
+
+
+def test_determine_action_after_close():
+    config = ExchangeHoursConfig(
+        exchange="XNYS",
+        delay_after_open=60,
+        delay_before_close=60,
+        action_when_closed=ActionWhenClosedEnum.exit,
+    )
+    now = datetime(2025, 1, 21, 21, 0, tzinfo=timezone.utc)
+
+    result = determine_action(config, now)
+    assert result == "exit"
+
+
+def test_determine_action_session_closed_wait():
+    config = ExchangeHoursConfig(
+        exchange="XNYS",
+        delay_after_open=60,
+        delay_before_close=60,
+        action_when_closed=ActionWhenClosedEnum.wait,
+    )
+    now = datetime(2025, 1, 21, 14, 29, tzinfo=timezone.utc)
+
+    result = determine_action(config, now)
+    assert result == "wait"
+
+
+@patch("thetagang.exchange_hours.time.sleep")
+def test_waited_for_open_under_max(mock_sleep):
+    config = ExchangeHoursConfig(
+        exchange="XNYS",
+        delay_after_open=60,
+        delay_before_close=60,
+        action_when_closed=ActionWhenClosedEnum.wait,
+        max_wait_until_open=600,
+    )
+    now = datetime(2025, 1, 21, 14, 29, tzinfo=timezone.utc)
+
+    assert waited_for_open(config, now) is True
+    mock_sleep.assert_called_once()
+
+
+@patch("thetagang.exchange_hours.time.sleep")
+def test_waited_for_open_exceeds_max(mock_sleep):
+    config = ExchangeHoursConfig(
+        exchange="XNYS",
+        delay_after_open=60,
+        delay_before_close=60,
+        action_when_closed=ActionWhenClosedEnum.wait,
+        max_wait_until_open=30,
+    )
+    now = datetime(2025, 1, 21, 14, 0, tzinfo=timezone.utc)
+
+    assert waited_for_open(config, now) is False
+    mock_sleep.assert_not_called()
+
+
+@patch("thetagang.exchange_hours.time.sleep")
+def test_waited_for_open_negative_difference(mock_sleep):
+    config = ExchangeHoursConfig(
+        exchange="XNYS",
+        delay_after_open=60,
+        delay_before_close=60,
+        action_when_closed=ActionWhenClosedEnum.wait,
+        max_wait_until_open=300,
+    )
+    # 'now' is already after the start time
+    now = datetime(2025, 1, 21, 15, 0, tzinfo=timezone.utc)
+
+    # seconds_until_start will be negative, but code checks if it's < max_wait_until_open
+    assert waited_for_open(config, now) is True
+    mock_sleep.assert_called_once()
diff --git a/thetagang/thetagang.py b/thetagang/thetagang.py
index bd477fc20..45989bd19 100755
--- a/thetagang/thetagang.py
+++ b/thetagang/thetagang.py
@@ -6,6 +6,7 @@
 
 from thetagang import log
 from thetagang.config import Config, normalize_config
+from thetagang.exchange_hours import need_to_exit
 from thetagang.portfolio_manager import PortfolioManager
 
 util.patchAsyncio()
@@ -24,6 +25,10 @@ def start(config_path: str, without_ibc: bool = False, dry_run: bool = False) ->
     if config.ib_async.logfile:
         util.logToFile(config.ib_async.logfile)
 
+    # Check if exchange is open before continuing
+    if need_to_exit(config.exchange_hours):
+        return
+
     async def onConnected() -> None:
         log.info(f"Connected to IB Gateway, serverVersion={ib.client.serverVersion()}")
         await portfolio_manager.manage()
diff --git a/uv.lock b/uv.lock
index d3d899088..ccf097484 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,10 @@
 version = 1
 requires-python = ">=3.10, <3.13"
+resolution-markers = [
+    "python_full_version >= '3.12'",
+    "python_full_version == '3.11.*'",
+    "python_full_version < '3.11'",
+]
 
 [[package]]
 name = "annotated-types"
@@ -88,6 +93,23 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/02/cc/b7e31358aac6ed1ef2bb790a9746ac2c69bcb3c8588b41616914eb106eaf/exceptiongroup-1.2.2-py3-none-any.whl", hash = "sha256:3111b9d131c238bec2f8f516e123e14ba243563fb135d3fe885990585aa7795b", size = 16453 },
 ]
 
+[[package]]
+name = "exchange-calendars"
+version = "4.8"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "korean-lunar-calendar" },
+    { name = "numpy" },
+    { name = "pandas" },
+    { name = "pyluach" },
+    { name = "toolz" },
+    { name = "tzdata" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/38/78/1802680e9ea575712411a8aa4bd2979c0cea510a007816fe88dbdc72199b/exchange_calendars-4.8.tar.gz", hash = "sha256:70d1f2dce712fb193aa56f67df17a292221a4c24589a0077fac3f41aaf5e0a29", size = 3854982 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/51/f4/c4762d034eecf246d1f836dcb9d51e126c5f008833ebbb987905fa03bac6/exchange_calendars-4.8-py3-none-any.whl", hash = "sha256:98990e1419e6379c22c19e8dff31ab0abf59a0841c24d21953f731b50b4125f9", size = 197757 },
+]
+
 [[package]]
 name = "faker"
 version = "33.3.1"
@@ -141,6 +163,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/ef/a6/62565a6e1cf69e10f5727360368e451d4b7f58beeac6173dc9db836a5b46/iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374", size = 5892 },
 ]
 
+[[package]]
+name = "korean-lunar-calendar"
+version = "0.3.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/5a/93/a0bd2bd53ab19330e83ecc5652b7774ae86fd2fee19bc05ad220cf9db08b/korean_lunar_calendar-0.3.1.tar.gz", hash = "sha256:eb2c485124a061016926bdea6d89efdf9b9fdbf16db55895b6cf1e5bec17b857", size = 9877 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/9c/96/30f3fe51b336bb6da4714f4fdad7bbdce8f13af79af2eb75e22908f3f9f4/korean_lunar_calendar-0.3.1-py3-none-any.whl", hash = "sha256:392757135c492c4f42a604e6038042953c35c6f449dda5f27e3f86a7f9c943e5", size = 9033 },
+]
+
 [[package]]
 name = "markdown-it-py"
 version = "3.0.0"
@@ -240,6 +271,41 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/88/ef/eb23f262cca3c0c4eb7ab1933c3b1f03d021f2c48f54763065b6f0e321be/packaging-24.2-py3-none-any.whl", hash = "sha256:09abb1bccd265c01f4a3aa3f7a7db064b36514d2cba19a2f694fe6150451a759", size = 65451 },
 ]
 
+[[package]]
+name = "pandas"
+version = "2.2.3"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "numpy" },
+    { name = "python-dateutil" },
+    { name = "pytz" },
+    { name = "tzdata" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/9c/d6/9f8431bacc2e19dca897724cd097b1bb224a6ad5433784a44b587c7c13af/pandas-2.2.3.tar.gz", hash = "sha256:4f18ba62b61d7e192368b84517265a99b4d7ee8912f8708660fb4a366cc82667", size = 4399213 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/aa/70/c853aec59839bceed032d52010ff5f1b8d87dc3114b762e4ba2727661a3b/pandas-2.2.3-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:1948ddde24197a0f7add2bdc4ca83bf2b1ef84a1bc8ccffd95eda17fd836ecb5", size = 12580827 },
+    { url = "https://files.pythonhosted.org/packages/99/f2/c4527768739ffa4469b2b4fff05aa3768a478aed89a2f271a79a40eee984/pandas-2.2.3-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:381175499d3802cde0eabbaf6324cce0c4f5d52ca6f8c377c29ad442f50f6348", size = 11303897 },
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