100 horror writing prompts and story ideas, by subgenre

Here are 100 original horror writing prompts, grouped by the kind of fear they run on, from haunted houses to folk horror, plus first lines and twist endings. Each one keeps a familiar trope and turns it a few degrees. Pick one that makes you slightly uncomfortable, change one detail so it is yours, and write the first scene in one sitting. A prompt can become flash fiction or a novel. The steps at the end show how to build dread from it instead of spending it all on page one.

Haunted house and place prompts

A haunted place works when it has one rule, and your characters learn it by breaking it.

1. Your new house came with twelve rules taped inside the pantry door. Number seven is scratched out so hard the pen tore through.
2. A night guard at a mall closed for two years finds the east-wing escalator running at 3:10 every morning, always going down.
3. Every door on the hotel's fourth floor has a number except one, which the staff never mention. Tonight it is propped open.
4. A family moves into a house with pale rectangles on every wall where mirrors used to hang. The seller insists there were never any mirrors.
5. Every buyer who tours the nursery asks the agent the same question: who painted over the window? There is no window.
6. A school reopens after summer with one extra classroom at the end of the hall. The children already know the teacher's name.
7. House-sitting for a childless friend, a woman finds a baby monitor in the kitchen, switched on and aimed at the guest-room closet.
8. Hikers find a cabin with the table already set, one place for each of them, their names on the cards.
9. At night, someone climbs the stairs of the apartment building, always one floor more than the building has.
10. An ambulance crew is dispatched to a hospital that closed in 1989. The call came from its front desk.
11. Clearing out their late father's house, three siblings find every clock stopped at the same minute, six hours from now.
12. In a drought, the reservoir drops far enough to show the steeple of the drowned village. On the third night, the bell rings.

Creature and monster prompts

Decide what a creature wants before you decide on teeth, and keep it offstage longer than feels comfortable.

13. Something in the lake imitates the voices of people who drowned there. This summer it calls for help as the lifeguard's brother.
14. A thing that can enter only if invited has spent ten years learning to sound like a lost child. Tonight it learned the right name.
15. Each night, a trail camera photographs the same deer a little closer to the house. In the last photo, it is looking in the kitchen window.
16. A fishing crew hauls up an animal nobody can name. It is alive, calm and holding a wedding ring.
17. The thing under the bed has spent years protecting the child from what lives in the closet. Tonight it is hurt.
18. The starlings under the eaves mimic the kettle, the doorbell and the dog. This week they started on a voice nobody in the family recognizes.
19. Every full moon, a woman locks herself in the basement. This month she wakes in her own bed, the basement still bolted from inside, and mud on her husband's feet.
20. A night nurse realizes the elderly patient in bed 9 looks younger every time someone on the ward dies.
21. Ice fishermen watch a shape under the frozen lake follow the line of holes they drilled, one by one, toward their shelter.
22. A man's imaginary friend from childhood comes back when he is 34. The friend is 34 too, and tired of being imaginary.
23. The town's lake monster was invented in 1952 to sell postcards. Tonight it is standing in the visitor center parking lot.
24. An exterminator clearing rats from a church basement finds they have built a small, careful copy of the church from rat bones.

Psychological and cosmic horror prompts

Psychological horror

Psychological horror keeps the reader unsure whether the threat is outside the character or inside, and an unreliable narrator is the classic tool.

25. A woman's husband comes home from a trip knowing where the spare key is hidden. She moved it while he was away.
26. A man keeps finding notes in his own handwriting warning him not to trust his wife, and they are getting more specific.
27. A narrator explains, calmly, why the neighbor's new fence threatens her family. By page two the reader realizes there is no neighbor.
28. After a car accident, a teenager comes home to a family that is loving, relieved and much too careful, as if she might notice something.
29. A man who lives alone keeps a list on the fridge of everything he has caught himself doing without deciding to. It started small.
30. A caregiver suspects the woman with dementia she looks after isn't confused at all, but trying to warn her about her son.
31. A widower has kept the house as his wife left it. One morning the bed is made with her hospital corners, which he never learned.
32. A sleep-study volunteer is told he talked all night. The researchers won't play the recording, only ask who Ellen is and why he kept apologizing to her.
33. The friend who helped a woman through her divorce has copied her haircut, her laugh, her coat. Now the daughter calls the friend Mom, as a joke.
34. Each morning in the rented cabin, the novelist's manuscript is a few pages longer. The new pages are her best work, and they are about her.
35. A boy says goodnight every night to the man in the hall. His parents' camera shows him at 3 a.m., waving to the empty hall, then to the camera.
36. Home for a funeral, a man is asked by everyone in town about his wife and kids. He has never married.

Cosmic horror

Cosmic horror is fear of scale, so keep the thing itself out of view and show what it does to maps, clocks and the people who notice.

37. Distant stars are going dark one by one, in a straight line that points at Earth. The line is getting shorter.
38. A county mapmaker finds a road that appears on every survey since 1880 and on no satellite image. She drives out to measure it.
39. A quarry blast opens a staircase sealed inside solid rock, going down. The rock that sealed it is older than the first animals.
40. A mathematician publishes a proof. Within a week, everyone who has read it is drawing the same shape in their margins.
41. A survey ship's sonar maps a structure on the ocean floor larger than any city. The next scan finds it a mile higher.
42. A radio telescope decodes a repeating signal from deep space: the observatory's own phone directory, with one extra extension.
43. Everyone on Earth dreams of the same empty room and a voice saying “not yet,” and three weeks later the voice says something else.
44. Scientists drilling an ice core find a thin black layer that, under the microscope, turns out to be writing.
45. The sun rises four minutes late and every clock agrees. Only a night watchman who has timed sunrise for forty years knows the minutes are missing.
46. A small congregation sings a hymn with a verse no hymnal contains, and a visiting musicologist realizes it is a set of instructions.

Folk horror and body horror prompts

Folk horror

Folk horror runs on a rural community that has made its peace with something, and several of these borrow real British and European customs: telling the bees, concealed shoes, the sin-eater.

47. A young doctor's new village still tells the bees about every death. Yesterday someone told the bees about her.
48. Renovating a cottage, a couple removes a child's shoe hidden in the chimney wall for protection. That night, something walks the upstairs hall in one shoe.
49. The last sin-eater in the valley died in the spring. Since then, no one in the village has died at all, however sick or old.
50. Every harvest, the town chooses someone to carry the last sheaf home. This year it is the new teacher, who has no idea what that means.
51. A walker on an old pilgrim route finds fewer people and more scarecrows in each village, dressed in clothes she saw in the last one.
52. A woman inherits her grandmother's house in a valley where everyone leaves milk at the crossroads each night. When she stops, nothing happens for three nights.
53. Each spring the islanders beat the parish boundary with willow sticks to keep it in place. This year a newcomer counting her steps finds it a mile shorter.
54. A folklorist finds a ballad whose verses name everyone who has died in the valley for two hundred years. The last verse has no name yet.
55. New neighbors welcome the family with bread, eggs and a carved doll of each child, perfect likenesses of children they have never met.
56. Builders find a sealed witch bottle under a pub hearth. While they argue about opening it, the landlord pours it down the sink.
57. On the solstice, every house in the hamlet unlocks its back door and bars its front. The visitor who doesn't know the rule gets it backward.
58. The town has no graveyard. When a surveyor asks where the dead are buried, everyone in the pub turns at once to look at the hill.

Body horror, without the gore

These stay non-graphic on purpose: the dread is in a change that is quiet, gradual and wrong, not in the wound.

59. A woman's fingerprints change overnight. The new ones match a set on file from a missing-person case in 1971.
60. A pianist's hands play by themselves at night, always the same piece. No one she plays it for has ever heard it.
61. A girl notices her shadow moves a beat behind her. A week later it moves a beat ahead.
62. After a heart transplant, a man wakes at 4:12 every morning craving a brand of cigarettes he has never smoked.
63. A woman's freckles are rearranging themselves, and her dermatologist hasn't told her they are forming a map of the city.
64. A man's reflection is aging faster than he is, and his wife can see it too. Lately the reflection looks worried.
65. Everyone at a remote research station has the same small rash on the left wrist, spreading like a sentence written one letter a day.
66. A long-distance swimmer notices her skin no longer wrinkles in the water. Then she notices she hasn't come up for air in a while.
67. A dentist tells a patient she has a full second set of adult teeth growing behind the first. On the X-ray, they aren't human.
68. The family's new baby has her late grandfather's laugh, his habit of tapping the table twice before he eats, and his scar.

Technology horror prompts

Many of these work as found documents, such as texts, logs and camera clips, the way epistolary classics like Dracula are told through letters and diaries.

69. The smart speaker in a rental apartment answers to a wake word nobody has said, and replies to questions nobody asked out loud.
70. A man's fitness tracker logs eight thousand steps every night while he sleeps, always to the end of the street and into a neighbor's yard.
71. A woman's late mother keeps texting her from her old number, with family news that hasn't happened yet.
72. The doorbell camera sends a motion alert at 2:16 every night. The clip always shows an empty porch and, through the glass beside the door, someone standing in the hallway.
73. A widow's app rebuilds her husband's voice from old voicemails, and it comforts her until it tells her things he never knew.
74. A content moderator keeps seeing the same figure in the background of unrelated videos, standing a little closer to the camera in each one.
75. A rideshare driver picks up at an address that exists only in the app. The passenger gives no destination, and the app starts routing anyway.
76. A family's photo app makes a slideshow of a holiday they never took, in a house they have never seen, with a child they don't have.
77. A self-driving car insists on taking the long way home and won't say why. The night its owner overrides it, he understands.
78. A woman's DNA test lists a close match on her father's side: herself, uploaded from a different account eleven years ago.
79. A night-shift technician finds a server rack on no inventory. It is warm, humming and labeled with his name.
80. A streamer playing a horror game alone notices her chat reacting to something behind her a full second before she hears it.

Horror first lines and twist endings

Opening lines

Keep each opening sentence or swap the details, then write the next paragraph without stopping to plan.

81. “The children came back from the woods on time, all eleven of them, which was the problem, because only ten had gone in.”
82. “My grandmother left me her house, her cat and a list of the people I am never, under any circumstances, to let inside.”
83. “We were told to keep the porch light on until morning, so of course the bulb went out at two.”
84. “When the search party found Mara on the ninth day, she was annoyed with us for moving her things.”
85. “The first thing I noticed about the new house was the smell of baking bread; the second was that the oven had been bricked over.”
86. “Nobody in Harlow locked their doors, because nothing there ever came in through a door.”
87. “Dad said the basement phone had been disconnected since 1987, so I don't know why it rang, or why I answered.”
88. “The dog stopped barking at the corner of the bedroom on Tuesday, which was worse, because now he just sits and watches it.”
89. “Every year on my birthday, a photograph arrives in the mail of me asleep.”
90. “I have been the only passenger on the 11:40 train for six weeks, and tonight the conductor asked if I was ready to get off.”

Twist endings to write toward

Work backward from each of these last-page reveals: plant the true answer early in plain sight and give the reader a fair red herring to suspect instead. Our foreshadowing examples show how classic writers hid their clues.

91. The house was never haunted. The family was, and the house has been trying to get rid of them.
92. The radio broadcast guiding survivors to the safe zone has been the same recording for three years, in the narrator's own voice.
93. At dawn, the people barricaded in the farmhouse realize the creatures outside were never trying to get in. They were guarding the door.
94. The heroine breaks the town's curse and no one vanishes that winter. In the spring, every child in town is gone.
95. The man who wakes in a locked room breaks out, and the bolts and warning signs outside the door tell him the room was built to hold him.
96. The detective finds the pattern: a week before vanishing, every victim reported seeing the detective outside their window.
97. The old camera doesn't predict who will die. It chooses, and the narrator has been taking the family's holiday photos with it all along.
98. The lifeboat survivors count heads every morning. On day nine someone checks the manifest: six people boarded, and they keep counting seven.
99. The charms in every window in the village were never meant to keep something out. They mark the houses it has already chosen.
100. The last entry in the journal the reader has been following all story is dated next week.

How to build dread from a prompt

A prompt gives you a situation. Dread comes from releasing it slowly, with the worst thing held back. Ann Radcliffe drew the distinction in “On the Supernatural in Poetry,” an essay published in 1826: terror, the anticipation, “expands the soul,” while horror, the confrontation, contracts and freezes it. Most good horror stories are built from the first and spend the second once.

1. Choose the one feeling you want

   Edgar Allan Poe argued in “The Philosophy of Composition” (1846) that a writer should settle the effect and the ending before anything else. Name the feeling precisely: being watched, being replaced, not being believed, arriving too late. Every scene either feeds it or goes.

2. Start ordinary, then make one thing wrong

   Spend the first page on an everyday routine in sharp detail, so the reader knows what right looks like. Then change one small thing: the spare key, the extra classroom. One wrong detail scares more than five, because the reader starts checking everything else.

3. Give the threat rules

   Decide what it wants, what it can do and what it can't, even if the reader never learns all of it. Rules let readers dread a specific moment, such as the light going out, instead of waiting for random shocks.

4. Show effects before the cause

   Keep the threat offstage: the dog that won't go upstairs, the neighbor who stops waving. H. P. Lovecraft opened “Supernatural Horror in Literature” (1927) by naming fear of the unknown the oldest and strongest kind. Every explanation trades some of that fear for understanding, so show only part of the thing.

5. Plant the ending early

   If the story turns on a reveal, put its clues in the first third, in ordinary sentences. A fair twist sends readers back to page one. An unfair one makes them stop trusting you.

6. Revise for restraint

   In the second draft, cut every sentence that explains the threat or tells the reader how to feel, and end a beat before relief arrives. If you write in Strokes, version history saves each draft as you go, so you can cut hard, preview an earlier version with the changes marked and restore it in one click if the cut went too far.

Here is prompt 72 opened with those steps in mind:

When a prompt keeps growing past short-story length, our guide to writing a horror novel picks up from there.