What does fillies and mares only mean in race conditions?
Explains the meaning of fillies and mares only in race conditions, what is restricted, how sex allowances and weight-for-age interact, how to read racecards and conditions, practical limitations, and a hypothetical worked example using official glossary terms.
By Emma RichardsonRacing News ReporterPublished · Updated · 963 words · 5 min read
The short answer
Fillies and mares only means a race that restricts entry to female thoroughbreds—fillies (younger females) and mares (older females)—so colts, geldings and horses of the male sex are not eligible. The race conditions will still specify age ranges, weight assignments and any penalties or allowances; the governing glossary and racecard explain those details rather than the plain phrase itself [bha-types] [gbr-glossary].
What the phrase restricts and what it does not restrict
Fillies and mares only is an eligibility filter specifying sex: only female thoroughbreds may start. In racing parlance a filly is generally a younger female and a mare an older female; exact age definitions appear in broader guidance and race conditions, not in the words alone. The glossary entries describe types of race restrictions and confirm that sex-based limits are one of the common condition types used to define who may run [bha-types] [gbr-glossary].
The term does not by itself specify age bands, weight carried, or whether the contest is a handicap, conditions race or listed/Group event. Those details are embedded in the race conditions published on the racecard and by the racing authority. So the phrase simply closes the race to males; everything else that affects a runner’s competitiveness is determined elsewhere in the published conditions and by the applicable rules [bha-types] [gbr-glossary].
Why some races are restricted to fillies and mares
Races limited to fillies and mares exist to provide competitive opportunities tailored to the female segment of the population, helping promote development, breeding value and progression through classes. The racing glossaries outline that races can be restricted for many reasons: age, previous wins, sales origin or rider status, and sex is a common restriction used across Flat and Jump codes to shape fields and racing pathways [bha-types] [gbr-glossary].
These contests can help owners and trainers place horses where they have a realistic chance of success against peers rather than against male rivals, who may have different physical development patterns. The guidance emphasises that conditions set out the nature of the race, and sex-only races are one of several condition types used to manage entries and racing programmes [bha-types] [gbr-glossary].
How sex restrictions interact with weight and conditions
Sex restriction removes male horses from the eligibility pool but it does not automatically change the weight structure. Weights in a race are assigned according to the race type: handicaps, conditions races, or level-weight pattern events. The British sources explain that conditions races determine weights through weight-for-age scales, sex allowances and penalties where relevant, and those allocation rules are always specified in the race conditions [bha-types] [gbr-glossary].
Therefore when you see fillies and mares only you should still read the full conditions to see whether a weight-for-age scale applies, whether there are penalties for recent wins, or whether the race is a handicap with a separate rating-based weight allocation. The phrase tells you who may run; the conditions tell you how much each eligible runner will carry [bha-types] [gbr-glossary].
How to read racecards and official conditions for female-only races
The racecard and official conditions sheet list who may run, ages allowed, and the weight carrying instructions for every declared horse. Glossaries note that conditions races allocate weights on specified scales and that restricted handicaps or classified stakes will have their own eligibility and weight rules. So check the fine print on the racecard rather than assuming standard allowances apply when the race is for fillies and mares [bha-types] [gbr-glossary].
Key items to read are the age band, the description of the race type (maiden, novice, handicap, conditions, Listed or Pattern), the weight schedule and any penalties or declared allowances. Local regulatory pages and the racecourse publication will show the definitive entry terms; the glossary entries explain these categories but the precise numbers and any trial rules must be read on the race-specific documentation [bha-types] [gbr-glossary].
Practical limitations and what this phrase does not reveal
Fillies and mares only does not indicate class level, prize money, whether the race is a handicap or a level-weights contest, or the exact weights to be carried. Official glossaries provide the taxonomy of race types and point readers to conditions for specifics; they do not present a universal weight or age threshold embedded in the sex-limited label. Always refer to the race’s published conditions to learn the full structure and any special eligibility points [bha-types] [gbr-glossary].
Another limitation is terminology variation: informal use of filly and mare is widespread, but regulatory age boundaries can differ between jurisdictions and between Flat and Jump codes. The glossaries explain the broader categories and their contexts; for any legal or entry decision consult the racecard and the regulator’s specific guidance rather than assuming the label alone supplies all necessary information [bha-types] [gbr-glossary].
Worked example
hypothetical: imagine a race advertised as a fillies and mares only two-mile conditions race for horses aged three and up. The phrase alone tells you only that male horses cannot run. To understand the contest you must open the published conditions which will state whether it is weight-for-age, whether three-year-olds receive a scale allowance, and if penalties apply for recent wins. The glossaries identify that those are the elements that define how weights are set [bha-types] [gbr-glossary].
In practical reading, you would check the racecard for the precise age band, the weight schedule, and any listed penalties or allowances. If it is a conditions race you might see allocations based on age and previous victories; if it is a handicap the BHA weight assignments will be used. The definitions and examples in the official glossaries show why the phrase limits only who may start and why the conditions must be consulted for the rest [bha-types] [gbr-glossary].
Related questions
Does fillies and mares only affect the weight a horse carries?
Yes. The phrase limits eligibility to females but the specific weight each horse carries is set in the race conditions, which may apply weight-for-age scales, penalties for prior wins, or other allowances. Consult the race conditions on the card for exact weights rather than assuming a fixed allowance.
Can a filly run in open company instead of a fillies and mares only race?
A filly may be entered in open races unless the specific race conditions or sport rules prevent it; entering in fillies and mares only races is a choice by connections or required by particular event eligibility. Race entries and conditions determine the permitted options.
Sources
- British Horseracing Authority: Glossary of race types — accessed
- Great British Racing: Jargon Buster — accessed
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