Regarding the time of throwing pebbles in Hajj, pilgrims may throw the pebbles any time during all the days of throwing, i.e. from the morning until the dawn of the following day. This is allowed for pilgrims so that they have plenty of time to perform this ritual at ease, especially if there is a valid excuse like heavy rain and the like. This viewpoint is reported to have been adopted by `Ataa’, the eminent jurist of Makkah in his time, and by Tawis, the eminent jurist of Yemen in his time. Both scholars received knowledge at the hands of one of the most knowledgeable persons in the Muslim Ummah, Ibn `Abbas (may Allah be pleased with him). So was also the opinion of Abu Ja`far Al-Baqir, an eminent scholar, and some contemporary scholars from the Shafi`i, Maliki, and Hanbali schools. This view was also reported to have been held by Imam Ahmad.
The eminent Muslim scholar Sheikh `Abdel Khaliq Hasan Ash-Shareef, a renowned scholar and da`iyah, states: In fact, many Muslim jurists — in the past and present — allow throwing the pebbles in Hajj before the zawal (noon). For example, Abu Hanifa, Ibn Al-Jawzi, some Shafi`i jurists allowed throwing before the zawal. Moreover, many contemporary Muslim scholars permit throwing pebbles before the zawal.
Given the above, throwing pebbles before noon is valid and correct, in sha’ Allah, taking into consideration the difficulties, harms, and hardships that pilgrims face because of limiting the time of throwing the pebbles.