The best time to do the Kings Canyon Rim Walk, and when it is closed

The rim is not closed by the calendar. It is closed by the forecast, so when the Kings Canyon Rim Walk is closed depends on the day. Tourism NT states that on days when the temperature is forecast to reach 36 degrees Celsius or higher, walkers must begin the Rim Walk before 9am, and that entry to the trail is not permitted after that time for safety reasons.¹ A walker who arrives late on such a day can still see the canyon from the floor walk, but not from the rim.

The wording matters. The rule talks about a forecast, so the deciding number is the one published for the day and not the temperature you feel at breakfast. Check the forecast the evening before, and again before you leave your accommodation, because a day that looked mild can be revised upward.

Tourism NT adds a wider piece of advice for the hotter months. From September to April, it says, it is best to avoid walking in the middle of the day and to consider shorter alternatives.² The same site suggests an early start and aiming to finish before 10am to avoid the heat of the day.⁵

Tourism NT describes four seasons in the Red Centre. Summer runs from December to February with average temperatures between 20 and 35 degrees Celsius, and January is the wettest month at around 40 mm of rain.¹⁰ Autumn, from March to May, brings warm days and cool nights, with averages of 12 to 27 degrees Celsius.⁷

Winter, from June to August, averages 3 to 20 degrees Celsius, and temperatures can drop below freezing overnight.¹¹ Spring, from September to November, averages 13 to 31 degrees Celsius.¹² Tourism NT also says the Red Centre is prone to extremes, with hot summer days and cold winter nights.¹³

Which season suits you depends on what you want from the walk. Tourism NT says winter is the most popular time to visit because the days are crisp, cool and not too hot.⁴ The shoulder seasons give warm days and cool evenings, which suits walkers who dislike the cold more than the sun. Summer asks for the earliest start and the most water.

If you are comparing the canyon with its neighbors, the heat rules are close cousins. Parks Australia says the Valley of the Winds Walk at Kata Tjuta closes at the first lookout from 11 am when the forecast or actual temperature reaches 36 degrees Celsius and above.¹⁷ The Kings Canyon rule uses the same figure but a different clock, because walkers must start before 9am.¹

At Uluru, Parks Australia says some base walk tracks close in the afternoon during the summer because of the high risk of heat stroke, and advises walking only in the cooler morning hours and finishing before 11.00 am in hot weather.^18,19 The pattern across the three walks is the same: the morning is the safe part of a hot day.

That pattern is why a day tour that leaves before dawn is not an inconvenience but the design. A coach that reaches the canyon early lets the group start the rim while the rock is still cool, and leaves lunch and the return for the hottest hours.

A monthly average is a guide and not a forecast. The Watarrka figures are NOAA averages for 1991 to 2020, so a given January can run hotter or cooler than the 38.4 °C average daily high that the record gives.³ The closure rule works on the day's forecast, which is why the sensible habit is to check it every time.¹

The station is also not the canyon. It is 4.6 km from Kings Canyon, which is close, but the rim and the creek floor have their own conditions, and a wind or a shaded gully can change how a number feels.³ Use the table to choose a month and the forecast to choose a morning.

Put together, the record and the rule give a simple planning order. Pick the cool months if you have the choice, start early in every month, treat 36 degrees Celsius as the line that makes a 9am start compulsory and keep the floor walk in reserve for the day when the rim is out of reach.^1,8