When did Zoroastrianism start? When did Judaism start?

What's the significance of one starting before the other if any?

Judaism came first, but Zoroastrianism was a huge influence on Judaism. Many scholars believe that Judaism was still polytheistic at the point in which Zoroastrianism arrived. Zoroastrianism is commonly believed to be the first monotheistic religion, though it does place great importance on both a creator and destroyer. This is probably where the concept of Lucifer/Satan, as adversary, came from. Before this, of course, one could see Set in Egyptian mythology as a major source of evil and strife, but Set was not diametrically opposed to a creator god, in a monotheistic setting.

Some Jews may dispute these claims, and it's not universal to believe that Zoroastrianism was this great of an influence on Judaism. Myself, I think it's pretty much obvious.

Zoroastrianism was the religion of Persia.

Judaism is considered to have started with Abraham who is considered to have lived about 4000 years ago.

1. NOT a long time ago.
2. A LONG time ago.
3. Anything to do with invisible space chappies is pure speculation and superstition.
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Zoroastrianism began with an ancient prophet called Zarathustra. Hey, his name is Zoroaster in Greek, get?! Zoroastrianism! He was an Iranian prophet who lived about 1500 B.C. The Jews have been around a long time, more than three thousand years in fact. "The argument that Judaism borrowed from Zoroastrianism is, as yet, unproven. In fact, if any borrowing was done, it was quite possibly the other way around. In the first place, the evidence actually indicates that Zoroaster wasn't even born until about the time of the Babylonian Captivity. Kenneth Boa states that his dates are sometimes given as between 628 to 551 B.C. If these dates are even relatively accurate then it is quite possible that Judaism did not borrow from Zoroastrianism. Rather, it may actually have been Zoroaster who borrowed from the religion of the Jewish captives in Babylon. It is certainly true that Zoroaster spoke of such things as the coming of a savior and the resurrection of the body and so on. But he may have borrowed these ideas from the Jewish captives in Babylon. Indeed, it appears that all of these ideas can be found in the Jewish Scriptures prior to the Babylonian Captivity."

Judaism started around 1800 BCE. Zoroastianism started around 600 BCE though there seems to Eb some evidence from other texts that the Corie ideas behind it started developing around 800 BCE. Either way, Judaism had been around for about 1000 years before Zoroastianism began.