On and off, hot and not — the phonics o sound shows up constantly once children start blending real words. It is the second sound in Jolly Phonics Group 3 (g, o, u, l, f, b), usually taught right after g, and most kids meet it in Reception or kindergarten, around age four to five.
This page covers the correct mouth shape for the phonics o sound, the official Jolly Phonics action, honest word lists, four short activities, and a free printable tracing sheet.
Download the Free Jolly Phonics 42 Sounds Chart
Get all 42 Jolly Phonics letter sounds on one free printable chart PDF — in teaching order with an example word for every sound.
How to Say the Short /o/ Sound
o here is the short vowel heard in on, dog, and hot: open your mouth and round your lips a little, keep your tongue low and toward the back, and switch your voice on. Keep the sound short and crisp, not stretched out.
The Jolly Phonics action is to pretend you are flicking a light switch on and off, saying o, o, o with each flick. A simple cue song works well too: chant “on, off, on, off, o, o, o” while your child mimes the switch.
Short o is easy to mix up with short a and short u — say cot, cat, and cut in a row and notice how your lips round more for cot, open wider and flatter for cat, and barely move for cut. It is also worth mentioning early that the long o in go, no, and boat is a different, later sound, so do not worry if your child asks about it yet.
A Short /o/ Story: Hot Tea for Danny
Danny was in the kitchen while his mom made tea for his dad. “Why doesn’t she make one for me too?” he wondered, and asked so many times that she finally poured him a small cup. The moment he wrapped both hands around it, he yelped, “O! It’s hot!” His mom laughed, “O, Danny, little boy — that is too hot for you.” He did not try to hold his own teacup again for a long time.
Real Words With the Short /o/ Sound
Because o here is a short vowel, it does not sit alone at the very end of a word the way a consonant sound does — so these are honest beginning and middle lists, with no forced “end” list.
Beginning:
- on
- off
- odd
- ostrich
- olive
- option
Middle:
- hot
- dog
- box
- lot
- top
- mop
- pot
- rock
Blend it:
- h-o-t → hot
- d-o-g → dog
- p-o-t → pot
- m-o-p → mop
- t-o-p → top
Watch out: adding a silent e, as in note, hope, and bone, turns short o into the long o sound — that is a different, later lesson, so it is fine to simply say “that one is a trick” for now if it comes up.
Ways to spell it: for this stage there is one main spelling to teach, the single letter o, as in on, dog, hot, and box.
Four Activities for the /o/ Sound
Switch hunt (2 minutes): walk around flicking light switches and naming anything you can find that has the /o/ sound — a mop, a pot, the dog.
Listen and mark (3 minutes): use the sheet below, say words out loud, and have your child mark true only when they hear /o/.
Trace it (5 minutes): the tracing worksheet is further down the page — say o, o, o with every stroke of the pencil.
Blend with flashcards (5 minutes): lay out the two cards below and build words like hot and dog together, sounding out each letter first. For more combinations, download the flashcards in pdf printable designs.
Video: The /o/ Sound in Action
Free Letter O Tracing Worksheet
Practice the capital and small o, and see more pages on our Free!- Printable Letter Oo Tracing Worksheets page.
/o/ and the Rest of the Jolly Phonics Order
o is the second sound of Jolly Phonics Group 3 (g, o, u, l, f, b). It comes right after the /g/ sound and just before the /u/ sound. Browse every sound, in teaching order, in our Jolly Phonics complete guide.
Frequently asked questions
What is the phonics o sound?
The phonics o sound is the short vowel heard in on, dog, and hot. It is the second sound taught in Jolly Phonics Group 3.
How do I model the /o/ sound for my child?
Open your mouth, round your lips slightly, and keep the sound short, as in the words on and hot, then use the light-switch action while saying o, o, o.
Why does my child say cat instead of cot?
Short a and short o are made with a similar mouth opening, so children often swap them. Saying cot, cat, and cut slowly in a row and watching your lips helps a child hear the difference.
When is the /o/ sound usually taught?
Most children learn it in Reception or kindergarten, around age four to five, as the second sound in Jolly Phonics Group 3.
