- Costco Ad 03/08/23 - 04/02/23 Click and scroll down.
Costco
Hours
| Monday: | 7:00 AM - 6:00 PM |
| Tuesday: | 7:00 AM - 6:00 PM |
| Wednesday: | 7:00 AM - 6:00 PM |
| Thursday: | 7:00 AM - 6:00 PM |
| Friday: | 7:00 AM - 6:00 PM |
| Saturday: | 7:00 AM - 4:00 PM |
| Sunday: | Closed |
Costco Ontario, CA (Hours & Weekly Ad)
1 Costco Ad Available.